Presentation on the topic of distribution of water in nature. Presentation "The role of water in nature"


Water (hydrogen oxide) binary inorganic compound, chemical formula H 2 O. A water molecule consists of two hydrogen atoms and one oxygen, which are connected by a covalent bond. Under normal conditions, it is a transparent liquid, colorless (in small volumes), odor and taste.


Distribution of water On Earth, approximately 96.5% of the world's water is in the oceans, 1.7% of the world's reserves are groundwater, another 1.7% in glaciers and ice caps in Antarctica and Greenland, a small portion in rivers, lakes and swamps, and 0.001% in clouds (formed from particles of ice and liquid water suspended in the air). An interesting fact is that the Earth’s mantle contains several times more water than the amount of water in the World Ocean.


Three aggregate states of water Liquid Gaseous Solid Water on Earth can take on various forms that can simultaneously coexist with each other: water vapor and clouds in the sky, sea water and icebergs, glaciers and rivers on the surface of the earth, aquifers in the ground.




High Specific Heat Capacity Water has the highest specific heat capacity. Physical quantity, numerically equal to the amount of heat that must be transferred to a body weighing 1 kg in order for its temperature to change by 1 ° C, is called the specific heat capacity of the substance.


The main climate thermoregulator Due to its high heat capacity, water in the seas and oceans, when heated in summer, absorbs a large amount of heat. Therefore, in areas located near water bodies, it is not very hot in summer and very cold in winter. This is due to the fact that in winter the water cools and gives off a large amount of heat.


Water vapor plays a significant role in plant life optical properties water vapor. The fact is that water vapor strongly absorbs infrared rays with a wavelength from 5.5 to 7 microns, which is important for protecting the soil from frost. An even more effective remedy for frost is dew and the formation of fog: moisture condensation is accompanied by the release of a large amount of heat, which retards further cooling of the soil.




Biological role Water plays a unique role as a substance that determines the possibility of existence and the very life of all creatures on Earth. The human body consists of 70-80% water, some plants contain up to 90% or more water. On average, the body of plants and animals contains more than 50% water


Universal solvent Water acts as a universal solvent in which the basic biochemical processes of living organisms occur. Each molecule of the solute is surrounded by water molecules, and the positively charged parts of the molecule of the solute attract oxygen atoms, and the negatively charged hydrogen atoms. Since a water molecule is small in size, many water molecules can surround each solute molecule.




Water is of key importance in the creation and maintenance of life on Earth, in the chemical structure of living organisms, in the formation of climate and weather. It is the most important substance for all living beings. Water is necessary for the life of all unicellular and multicellular living beings without exception. Without water there would be no life on Earth.


Used literature and website materials: baltecopool.ru dic.academic.ru teme-mirovoy-okean-tixii/ teme-mirovoy-okean-tixii/ Water-Posters_i _.htm Water-Posters_i _.htm ru.wikipedia.orgWater Physics. 8kl. : textbook for general education institutions / A. V. Peryshkin.







































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Abstract for the presentation

Presentation work on the subject " The world", prepared by two teachers at once. this work is dedicated to water; during the lesson, schoolchildren must evaluate its role in nature and in the life of an ordinary person.

    Format

    pptx (powerpoint)

    Number of slides

    Politova S. V., Chepelevskaya N. S.

    Audience

    Words

    Abstract

    Present

    Purpose

    • To conduct a lesson by a teacher

Slide 1

Ecological game from the series “Enter nature as a friend”

Politova Svetlana Viktorovna – chemistry teacher;

Chepelevskaya Nina Stanislavovna – primary school teacher

Municipal educational institution secondary school No. 3 of the city of Shchelkovo, Moscow region

Slide 3

Guess the riddles

They drink me, they pour me out.

Everyone needs me

Who am I?

What can't you roll up the mountain?

You can’t carry it in a sieve,

Can't hold it in your hands?

Slide 4

Water on planet Earth

Let's talk...

Slide 5

  • We are watching...
  • Let's draw conclusions...

Water takes up much more space than land

Slide 6

Water in nature

  • What kind of water is there?
  • Slide 7

    • In the spring
    • In the stream
    • In a puddle
    • Fresh water
    • In the lake
    • In a swamp
    • In a river
  • Slide 8

    Salty water

    • In the ocean
    • In the sea
  • Slide 9

    Slide 10

    Insects

    • Who needs water
  • Slide 11

    Aquatic life

    • Who needs water
  • Slide 12

    • Who needs water
  • Slide 13

    • Animals
    • Who needs water
    • Birds
  • Slide 14

    • Properties of water
    • Practical part
    • Solubility
    • Form
    • Fluidity
    • Transparency
    • Results
  • Slide 15

    Shape of water

    • Water has no shape
  • Slide 16

    Shape of water

    • Water has no shape
  • Slide 17

    Water color

    • Water has no color
  • Slide 18

    Water clarity

    • The water is clear
  • Slide 19

    Solubility in water

    • Water is a good solvent
  • Slide 20

    Solubility in water

    • Water is a good solvent
  • Slide 21

    Conditions of water

    • hard
    • gaseous
    • liquid
    • liquid
  • Slide 22

    • Water in natural phenomena

    Guess

    Slide 23

    • guess a riddle

    It grows upside down, It grows not in summer, but in winter.

    But the sun will bake her -

    She will cry and die

    Icicle

    Slide 24

    • guess a riddle

    Fluffy cotton wool

    Floating somewhere.

    The lower the cotton wool,

    The closer the rain comes

    Slide 25

    • guess a riddle

    In a blue shirt

    Runs along the bottom of a ravine

    Slide 26

    • guess a riddle

    There's a commotion in the yard -

    Peas are falling from the sky

    Slide 27

    • guess a riddle

    No boards, no axes

    The bridge across the river is ready.

    The bridge is like blue glass!

    Slippery, fun, light!

    Slide 28

    Why do things dry out?

    Slide 29

    Slide 30

    Water cycle in nature

    Slide 31

    How does a person use water?

    Slide 32

    How water works for a person

    • Power plants
    • Water mills
    • Cargo transportation
    • Plants and factories
    • Resting-place
  • Slide 33

    Water consumption

    • 1890 1 bucket

    How much water did the person consume?

    • 1914 7 buckets
    • 2011 70 buckets
  • Slide 34

    Let's sum it up

    • Economist
  • Slide 35

    O L C O Z O L D N V U O I

    1 2 3 4 1 2 3 4 O O S A M V D U X

    Crossword

    P X V O D A

    Slide 36

    Homework

    • Complete a complaint book
    • Mrs. Droplet's motto
    • “Saving water means saving life”
    • Ms. Droplets' Complaint Book
    • Task: click on the pencil
  • Slide 37

    Slide 38

    Slide 39

    View all slides

    Abstract

    Lesson topic: “Water”.

    Slide number 17.

    WHERE DOES WATER COME FROM?

    Water appears from a stream,
    The river collects streams along the way,


    The seas replenish the ocean's supply:


    She's rising higher... for now
    Doesn't turn into clouds.
    And the clouds, flying above us,




    All this is what people call:

    WATER CYCLE IN NATURE.

    Rain clouds have arrived;
    Rain, rain, rain.
    The raindrops are dancing as if alive;
    Drink, rye, drink.

    Drinks, drinks, drinks.
    And the quiet rain, restless,
    It pours, it pours, it pours.

    If our hands are waxed,
    If there are blots on your nose,
    Who is our first friend then?
    Will it remove dirt from your face and hands?

    What mom can't live without
    No cooking, no washing,
    Without what, we will say frankly,
    Should a person die?

    For the rain to fall from the sky,
    So that the ears of bread grow,
    For ships to sail -
    We cannot live without... (water).

    Lesson on the surrounding world in 1st grade based on the integration of ecology, chemistry and the surrounding world.

    (Program by A.A. Pleshakov “The world around us”)

    Chepelevskaya Nina Stanislavovna – primary school teacher.

    Lesson topic: “Water”.

    Lesson duration: 45 minutes.

    Goal: to summarize students’ knowledge about water, to show that water is a unique natural substance.

    Lesson objectives: teach to see, compare, analyze. Expand knowledge about water and its role in human life. To cultivate a caring attitude towards water, the responsibility of every person in solving environmental problems.

    Form of training organization: frontal, group, pair, individual.

    Equipment: computer, multimedia console; presentation "Water". Equipment for conducting experiments: beakers of various sizes, test tube, flasks, teaspoon, funnel, filter paper.

    Presentation management. From the main slide (No. 2) we use hyperlinks to go to the slides we need. Random slide transition has been cancelled. Refunds are made using the arrows. The presentation uses triggers.

    Organizing time. Emotional mood of students. Motivation of students.

    Primary school teacher. Today we will try to look at the obvious, but we hope that it will also seem incredible to us. What do we want to learn about today? Let's try to guess. The teacher tells the children riddles about water. You need to guess the item being described. This technique is used because guessing broadens the child’s horizons, teaches him observation skills, and focuses attention on the subject being guessed. Slide No. 3. Children read the riddle on the slide (frontal and paired form of work), consult with each other and show their readiness to answer (the children have prepared cards with droplets of water on a green and red background in advance). A red card means: I don’t know, a green card means the answer is ready.

    Slide number 4. Primary school teacher. Let's think about where on Earth there is water? Children answer: in the sea, in the river, in the lake, in the spring, in the swamp, in the puddle. Together we conclude: there is a lot of water on the planet - land occupies only one third of its surface. It is surprising that the planet is called “Earth” and not “Water”. When people flew into space, they saw that our planet was blue. If you look at the globe (slide number 5), you can see that the bulk of water is concentrated in the oceans and seas. In them it is bitter and salty.

    Primary school teacher. Slide number 6. What kind of water is there on earth? We answer together: salty and fresh. Let's look at the presentation slide. It turns out that almost all the water on Earth is salty, and only a small part is fresh.

    Primary school teacher. Who needs water on Earth? From the main slide, go to the “Who needs water” block via the hyperlink. Slides No. 10-13. Front form of work. Children call: plants, insects, aquatic inhabitants, humans, birds, animals. We conclude: water is something that no inhabitant of planet Earth can do without.

    Practical part. Chemistry teacher. What properties does water have? To answer this question it is necessary to conduct research. Slide number 14. This slide shows the properties that substances have. Let's read together: shape, fluidity, color, transparency, solubility. Let's check if water has these properties? Follow the hyperlink to slide number 15. We have to prove whether water has a shape. To understand this, we will do a simple experiment. Pour a small amount of water from a large beaker into vessels that have different shapes.

    What are we seeing? What form does water take in different containers? We conclude: water has no shape, it takes the shape of the vessel into which it is poured. Slide number 16. Fluidity of water. What property do we use: pour water from one glass to another. Place a small amount of water on a glass slide and observe. Conclusion: water has the property of fluidity.

    Slide number 17.

    Water color. We have to make sure: does the water have color? There are three beakers on our display table. In the first - Orange juice, in the second - milk, in the third - water. We observe and draw conclusions: in the 1st color it is orange, in the 2nd it is white, in the third there is no color. Water has no color, which means it is colorless. Slide number 18. Transparency. Three glasses of liquid: orange juice, milk, water. Take turns lowering a plastic spoon into each liquid. What we are seeing. In the first two glasses we do not see the part that is immersed in liquid, but in a glass of water we see the entire spoon. This means: the first two liquids are not transparent, but water is transparent, this allows us to observe an object completely immersed in a glass of liquid. Slide number 19. Solubility in water. We place different substances in three beakers: salt, sugar, chalk. Mix thoroughly. What are we seeing? Sugar and salt are highly soluble in water, but chalk does not dissolve in water. We conclude: water is a good solvent. Let's summarize. Slide number 20. On this slide there is a chest of knowledge. If we learned something new today, we can put this knowledge in our chest - it will be useful to us in later life.

    Let's rest. Slide number 21. Chemistry teacher. Water – liquid substance. Depending on the temperature, it changes its state of aggregation: when cold it turns into ice, and when heated it turns into steam. We are interested in learning about these transformations. Let's play our guessing game and find out in what states water occurs in nature. Slide number 22. Every drop is a mystery. Click the hyperlink to go to the tasks. Slides No. 23 – 27.

    The water cycle in nature. Slide number 30. Children read a poem by Andrei Usachev:

    WHERE DOES WATER COME FROM?

    Water appears from a stream,
    The river collects streams along the way,
    The river runs full of water in the open space,
    Until it finally flows into the sea.
    The seas replenish the ocean's supply:

    The moisture thickens over it like sour cream,
    She's rising higher... for now
    Doesn't turn into clouds.
    And the clouds, flying above us,

    It rains and snows.
    The snow will turn into streams in the spring,
    Streams will run to the nearest river...
    All this is what people call:

    WATER CYCLE IN NATURE.

    Chemistry teacher. The sun heats the surface of our planet. As a result, a huge amount of water evaporates. Water vapor rises up from the surface of seas and oceans, rivers and soil. Water turns into steam at any time of the year, even in winter. Tiny droplets of water form clouds. The moisture accumulated in the clouds falls in the form of rain or snow and everything repeats all over again. This is called the water cycle in nature.

    Physical education minute. Slide number 28. Children move little, remaining in one position for a long time. To prevent fatigue and overstrain during the educational process, it is necessary to conduct physical training sessions. Physical education minutes in primary school represent active recreation aimed at reducing fatigue in children, activating attention and increasing the ability to more effectively perceive material.

    Rain clouds have arrived;
    Rain, rain, rain.
    The raindrops are dancing as if alive;
    Drink, rye, drink.
    And the rye, bending towards the green grass,
    Drinks, drinks, drinks.
    And the quiet rain, restless,
    It pours, it pours, it pours.
    Each line is accompanied by movements.

    How water works for a person. Primary school teacher. Water plays an important role in the life of humans, plants, and animals. Why and why is water so necessary? Water is the most common liquid on Earth. A person needs a lot of water to live. Let's think about where people use water? Hyperlink to slide number 31. Let's draw conclusions together. Water helps produce electricity at power plants. Water transports goods along rivers and seas, grinds grain, and is used in factories and factories. Clean water in rivers and lakes brings a lot of joy to people on vacation - you can swim, water ski and bike, and go boating. But where does a person get water? Go to slide number 33. Fresh good water there is underground. In some places it flows to the surface - these are springs. People dig wells, drill wells, and use water supply in cities where a lot of people live. Let's think about how to save water if people need it so much. The teacher brings to mind that water must be treated with care and not wasted. In rural areas, people protect springs and cover wells to prevent dirt from getting into them. In cities, people also need to conserve water and use it sparingly. The children and the teacher discuss that water consumption has increased greatly and that our previous generations used less water than we did.

    Water connoisseurs page. On slide number 34 we see an ecologist, a doctor, a poet and an economist. (Children come out wearing improvised hats with inscriptions: ecologist, economist, doctor, poet).

    Ecologist: industrial enterprises consume a lot of water, and it is becoming less and less. They pollute the water, and as a result there will come a time when we will not have clean water left. In many countries, clean water is sold in stores.

    Doctor: our health depends on what kind of water we drink. Drinking dirty water can make a person sick or even die. Drink only filtered water. It is better if you boil the water before drinking.

    If our hands are waxed,
    If there are blots on your nose,
    Who is our first friend then?
    Will it remove dirt from your face and hands?

    What mom can't live without
    No cooking, no washing,
    Without what, we will say frankly,
    Should a person die?

    For the rain to fall from the sky,
    So that the ears of bread grow,
    For ships to sail -
    We cannot live without... (water).

    Economist: we use only clean and fresh water. Save water! Remember how little fresh water there is on Earth!

    Crossword. On slide number 35 we solve the crossword puzzle. Horizontally:

    As a result, we get the word water (vertical arrangement).

    End of lesson. Summarizing. Water is a unique substance of nature that must be protected!

    There is a small blue planet Earth in the Universe. And this planet will live as long as there is an amazing substance on it - water. Today we are convinced that water has unique properties. By changing nature, a person changes the basis of life - water, and no one can say what terrible consequences careless handling of water can lead to. Water is a unique substance of nature that must be protected! Keeping water clean means saving your life.

    The waters of the oceans, seas, and rivers must be clean.

    And every smart person should remember this.

    Primary school teacher. What awaits you, future adult? You are an inhabitant of planet Earth! You rejoice at a ray of sun and wind, a drop of water on a flower, a snowflake on your palm, rain in the window. Remember that you must do many useful things to make life on your planet better. Study to know, study to create. Overcome the difficulties in your path and make every moment better.

    Homework. Complete the “Complaint Book of Mrs. Droplet.” The complaints in it are unusual, they are in the form of drawings. Mrs. Droplet's motto: “Saving water means saving life!”

    Literature and used Internet resources:

    • Borovsky E.E. Water in nature. Deficiency of clean fresh water.- M: Chistye Prudy, 2009. – 32 p.
    • Aksenova Z.F. Enter nature as a friend. – M: Sphere shopping center, 2008 – 128 p.
    • Nikolaeva S.N. Young ecologist. – M: Mosaika-Sintez, 1999 - 224 p.
    • Ananyeva E.G., Mirnova S.S. Earth. Complete encyclopedia. – M: Expo, 2008.-256 s
    Download abstract

    The role of water in nature

    WATER Water is the most common and important substance on Earth. The total water reserves on the planet are 133,800 cubic kilometers. Of this amount, 96.5% comes from the World Ocean, 17% is groundwater, 1.74% is glaciers and permanent snow. However, the total freshwater reserves account for only 2.53% of the total water reserves.

    Fresh water supplies on the planet are limited, but they are constantly renewed. The rate of water renewal determines the water resources available to humans. In the patriarchal era on Earth, the water cycle, which included drains, rains, snowfalls, floods, etc., was, despite natural disasters, beneficial for humans. Rains and meltwater irrigated the land, brought substances beneficial to plants, and revived the very environment of nature.

    With the development of civilization, when chemical fertilizers appeared, detergents, internal combustion engines, when human activity became nature-transforming, when man separated himself from nature and stood above it, human waste began to pollute everything, and primarily reservoirs. In ancient times, when man lived in harmony with nature, any fresh water, with the exception of swamp water, was potable. There was sea water and just water, without any additional definitions. It was believed that water was a mineral that a person should consume naturally.

    Now a person is talking about a separate type of water - drinking water. In addition, there are waters of rivers and lakes where people can and cannot swim. There is wastewater, there is acid rain, there are emissions from industrial waste reservoirs, from which all living things in the water die. Today, the water cycle in nature is tightly connected with the technogenic environment.

    In the primary water shell of the globe there was much less water than now (no more than 10% of the total amount of water in reservoirs and rivers at present). An additional amount of water appeared subsequently as a result of the release of water that was part of the earth's interior. According to experts, the Earth's mantle contains 10-12 times more water than the World Ocean. With an average depth of 4 km, the oceans cover about 71% of the planet's surface and contain 97.6% of the world's known free water reserves. Rivers and lakes contain 0.3% of the world's free water.

    Glaciers are also large reservoirs of moisture; they contain up to 2.1% of the world's water reserves. If all the glaciers melted, the water level on Earth would rise by 64 m and about 1/8 of the land surface would be flooded with water. During the era of glaciation in Europe, Canada and Siberia, the thickness of the ice cover in mountainous areas reached 2 km. Currently, due to the warming of the Earth's climate, the boundaries of glaciers are gradually retreating. This causes water levels in the oceans to slowly rise.

    Very great importance in the life of nature is the fact that the highest density of water is observed at a temperature of 4°C. When fresh water bodies cool in winter, as the temperature of the surface layers decreases, more dense masses of water sink down, and warmer and less dense masses rise from below in their place. This happens until the water in the deep layers reaches a temperature of 4°C. In this case, convection stops, since there will be heavier water below. Further cooling of water occurs only from the surface, which explains the formation of ice in the surface layer of reservoirs. Thanks to this, life does not stop under the ice.

    Sea water freezes at a temperature of -1.91°C. With a further decrease in temperature to - 8.2°C, precipitation of sodium sulfate begins, and only at a temperature of - 23°C does sodium chloride precipitate from the solution. Since part of the brine leaves the ice during crystallization, its salinity is less than the salinity of sea water. Multi-year sea ice becomes so desalinated that it can be used to produce drinking water. The temperature of maximum density of sea water is below freezing point. This is the cause of quite intense convection, covering a significant thickness of sea water and making freezing difficult. The heat capacity of sea water ranks third after the heat capacity of hydrogen and liquid ammonia.

    Snowflakes, as a rule, come in the form of six- and twelve-rayed stars, hexagonal plates, hexagonal prisms. As the air temperature decreases, the size of the crystals formed decreases and the variety of their shapes increases. The characteristics of crystal growth in air are associated with the presence of water vapor in it.

    Today, all people know the fact that water is the source of life on Earth.

    Abstract "Water on Earth" (with introspection)

    Geography teacher MKOU Secondary School No. 21

    Lesson objectives:

    To consolidate knowledge about the atmosphere - introduce the three states of water and its properties; - develop a careful attitude towards the water resources of our planet.

    Equipment: - a globe, - a physical map of the hemispheres, - a poster with a rebus and the properties of water, - glasses of water and milk for experiments, salt, sugar, a spoon, - children's drawings about water in nature

    Educational film "Hymn to Nature"

    Presentation "Water in Nature"

    Lesson preparation:

    It is written on the board: number. Each child has a printed notebook prepared for checking their homework.

    During the classes

    1. Checking homework.

    We check workplace equipment .

    The officers on duty check the weather calendars.

    a) Conversation.

    What topic did we study in previous lessons? -Open the textbook on pages 78-79 and work with questions according to the rubrics.

    b) Individual work in the workbook. The teacher reads each task, and the children fill out a workbook.

    At the end of work there will be a physical education session.

    2. Setting the goal of the lesson.

    It is difficult for us to live without many minerals. But there is one wealth that is absolutely impossible to do without. What kind of wealth this is, we learn from the riddle.

    • “What can’t be rolled up a mountain, carried away in a sieve, or held in one’s hands?” (Water).
    • Why can’t we roll it up the mountain? (Flows from top to bottom)
    • Why can’t you carry it away in a “sieve”? (It will leak through the holes)
    • Why can’t you hold it in your hands? (It will pour out)

    Today in class we will talk about water. The topic of our lesson is “Water on Earth”. (The teacher writes the topic on the board, and the children in their notebooks).

    3. Explanation of new material.

    A). The role of water in the life of humans, plants and animals.

    Guys, what role does water play in human life? Why and why is it necessary? How does a person use water? (Washes, drinks, cooks, washes dishes, floors, laundry, bathes, in heating systems, etc.).

    Human blood consists of 98% water, human muscles - 70% water, and in general the human body, brain, body tissues are more than half made of water. A lack of water is more dangerous for a person than starvation: a person can live more than one month without food, but only a few days without water. A person consumes from 3 to 6 liters of water per day (depending on the climate).

    Water is necessary for both animals and plants. All plants “drink” water and receive the necessary substances for growth and development. Water is contained in the root, leaves, trunk, and bark of a tree.

    For example, to grow 1 kg of potatoes, 300 liters of water are needed.

    Without water, plants wither and may die. Animals also need water to live.

    What conclusion can we draw?

    Conclusion: All plants, animals, and people need water for nutrition and cooling. Without water there will be no life.

    b) Water forms the aqueous shell of our planets-hydrosphere(from the Greek words “gyra” - water, “sphere” - ball.

    In front of you is a globe - a model of the Earth. The same ones on him symbols, just like on the map. Remember what the colors blue and cyan mean? (Water). Green and brown? (Plains and mountains).

    On the globe these are continents or land. I spin the globe around its axis. Which color is dominant? (blue). What follows from this?

    On the ground most The oceans occupy water spaces: the Pacific, Atlantic, Indian and Arctic. (The teacher shows the oceans on the map, children -on the map in the textbook pp. 82-83).

    Draw a diagram on the board:

    Three quarters of the globe is occupied by water.

    4. “Water in nature” presentation screening.

    Guys. Have you now seen where water can be found in nature? (Rivers, lakes, seas, springs, wells, puddles, dew, rain, fog, clouds, ice, snow, hail, frost)

    5. Three states of water.

    You said that cloud (fog), dew, snow are water. But somehow it is different in dew, snow, fog. How is it different? (Cloud, fog is steam (water in the form of steam), dew is water in liquid form, snow is water in solid form, crystals).

    What kind of substance is water: liquid, solid or steam?

    Conclusion. Water is a special mineral because it can be in three states at the same time.

    A diagram is drawn on the board and in notebooks.

    Give examples where at home you can see water in the form of liquid (from the tap), in the form of steam (cooking food - steam), in solid form (in the refrigerator)?

    I wonder if water can go from liquid to vapor? (Yes).

    Under what conditions will this happen faster? (It needs to be heated).

    And from liquid to solid? (Cool).

    And vice versa from solid to liquid? (We need to heat it up, because ice and snow melt in warmth).

    How about going from a solid state to a vapor? (Yes)

    Give examples. (In winter, my mother dries her laundry on the balcony. It immediately freezes, that is, liquid water becomes ice, but still it dries out (almost), therefore, solid water can turn into steam.)

    Can steam become a liquid again or become a solid? (Yes, if you cool it down. Clouds, drops in the bathroom on the ceiling, hail).

    Conclusion: Water is a wonderful mineral. It can be in three states at once and move from one to the other two. There is no other mineral like this!

    Properties of water.

    Let's look at the properties of water and determine what properties it has.

    On the board there is a poster “Properties of water”. The listed properties are revealed gradually as they are determined as a result of experiments.

    What word is encrypted? How did you guess?

    Let's conduct experiments and figure out what properties of water are hidden on the poster.

    Experience No. 1. What will happen to water if I drop it on glass? (Spread)

    Water doesn't hold its shape. I'll pour water from the jar into a glass. What form did the water take? (Shape of a glass).

    Conclusion: Water has no form and takes the form of the vessel into which it is poured.

    What property of water allowed us to pour it from a jar into a glass? (Fluidity).

    Experience No. 2. Two glasses - with milk, with water, a spoon. What can you say about the color of milk? (White) What about water? (colorless) Immerse the spoon in a glass of water. The spoon is visible from all sides.

    Conclusion: Therefore, the water is clear.

    Experience No. 3. I take sugar and salt. Which one is a mineral? (Salt) Why not sugar? (Manufactured by humans). I put sugar and salt into glasses with water, spoonfuls at a time, and stir. What happened to salt and sugar? (Melted) Why? (Water dissolved them)

    Conclusion: Water is a universal solvent. It completely dissolved the salt and sugar and remained transparent. For example, one liter of ocean water contains on average 35 grams of salt (mostly table salt), which gives it a salty taste and makes it unsuitable for drinking and use in industry and in agriculture.

    Experience No. 4. If we smell plain water, what does it smell like? What about the taste?

    Conclusion: The water is odorless and tasteless.

    Which water tastes better: rainwater, tap water or spring water? Why? You said that water has no taste.

    Rain water has no needed by the body salts, so it seems tasteless. Tap water poorly purified, filters are needed - means for water purification. Rodnikovaya- dissolves minerals underground, passes through sand (natural filter), but it is better to boil before use.

    What is the difference mineral water from the usual one?

    Fairy tales often talk about living and dead water. Most likely, these fairy tales were born from life. Is there really water that has life-giving, healing powers?

    Student's story about mineral water (advanced task). Regional component.

    Distribution of water on Earth (drawing in the textbook p. 80)

    6. Careful attitude towards water.

    There is a lot of water on Earth, but clean water is becoming less and less. This is not because water supplies are depleting. And why? The threat of pollution looms over the water. Who is polluting it?

    Plants, factories, hydroelectric power stations consume large amounts of water and at the same time pollute it with various waste products. Various toxic substances enter rivers and lakes with waste (used) water from enterprises. Life, fish, plants, animals die in water. Decaying waters poison the air and become a source of serious diseases. The river is “sick”; its waters cannot be used by humans.

    We must save water! By taking care of the purity of water, we take care of our health and the beauty of the surrounding nature. Our country has adopted a number of laws aimed at protecting waters. Their implementation is monitored by authorities state power, ecologists.

    How can you guys take care of the cleanliness of water bodies? (Do not throw cans, bottles, or other garbage. Use water sparingly).

    You can show posters and drawings calling for saving water.

    “Close the tap tightly so the ocean doesn’t leak out.” “Pour water sparingly, know how to value water.”

    7. Students read poems and show their drawings.

    We study the hydrosphere,

    We answer questions.

    Water - mineral, water - ash - two - oh,

    Water is above all else in the Universe.

    Let me ask you then

    What state is water in?

    / Students’ answers - in solid, liquid and gaseous./

    The little neighbor asked the other day

    At the stream pouring from the tap:

    Where are you from?

    Water in response:

    From afar;

    From the ocean!

    Then the baby walked in the forest

    The whole clearing sparkled with dew

    Where are you from?

    I asked Dew.

    Believe me too

    From the ocean!

    A gray fog lay on the field

    The kid asked the fog too

    Where are you from?

    And I, and I'm a friend from the ocean!

    Amazing isn't it?

    In soup, tea, in every drop,

    In a ringing piece of ice

    And in the rain,

    And in the dewdrop and in the river

    Will always respond to us

    Ocean water!

    8. Work according to the textbook(pp.80-81, pp.84-85)

    9. Summing up the lesson - presentation “Water in Nature”.

    Local history material

    Cold, hot, fresh and mineral underground waters are common in our region. 12 types of Mineral water from our region are known all over the world.

    The waters of Pyatigorye are unique natural underground factories of medicines.

    In the cracks of failed volcanoes, water accumulates, saturated with hot solutions and gases coming from deep pockets of frozen magma, and then rushes to the earth's surface, forming dozens of springs at the foot of the mountains.

    Our area has underground interstratal waters:

    thermal, fresh, salt and mineral.

    Thermal waters have a temperature of 90 degrees, with a very high salt content, these waters are still little used.

    Mineral waters have not been fully studied and taken into account, but the local population has been using them for a long time. In the area of ​​the village of Podgornaya there is a spring that treats skin diseases,

    In the village of Nezlobnaya and in the area of ​​the Georgievsky flour mill there are healing springs gastrointestinal tract. In the area of ​​Mount Lysaya there are diseases of the musculoskeletal system. In the area of ​​the city lake, a hydropathic clinic was built, using iodine-bromide waters