Water Class 4 - EVS kkgoenka

- June 16, 2021

Water

By Aashish Gupta Sir

Class 4

Water

Water is most important gift of nature.

70% of Earth's surface is covered with water.

Life is impossible without water.

We need water for drinking, cooking, washing, bathing etc.

Water is essential for proper growth of plants also.

Forms of Water

Water exist in three forms -

1.   Ice - Solid form
2.   Water - Liquid form
3.   Water Vapour - Gas form

Sources of Water

3 sources of water are -

1. Rain

2. Ground Water Sources Large water bodies - Seas , Oceans

Small Water Bodies - Lakes, Ponds, Rivers, Streams

3. Under ground water - Wells, Tube Wells,

Ground Water

Water that is available on ground in water bodies like Rivers, Lakes, Ponds, Streams, Seas, Oceans

Underground Water

Water that is under the ground is called ground water.

We can get groundwater by hand pumps or by using electric motors through wells and tube wells.

Sources of ground water are Wells, Tube Wells, Hand Pumps.

Drinking Water

Water good/fit for drinking is called Potable water.

Sea water is not fit for drinking as it contains salt.

Pure water has no taste.
Pure water has no colour.
Pure water has no odour.

Different Processes

1. Melting - Conversion of solid into liquid is called Melting.

2. Freezing - Conversion of liquid into solid is called Freezing.

3. Evaporation - Conversion of liquid into vapour is called Evaporation.

4. Condensation - Conversion of gas/vapour into liquid or solid form is called Condensation.

Ques.A. Write True or False against the following statements -

1. Water good/fit for drinking is called potable water.

2. Water is one of the most important gift of nature.

3. Pure water has taste.

4. Water vapour changes into liquid water in the process called evaporation.

5. Conversion of water into ice is called freezing.

Ques. B. Define the following -

1. Melting

2. Freezing

3. Evaporation

4. Condensation

Ques. C. Fill in the blanks using clues given in the box -

ground water 70% crops polluted water freezing Potable water melting tasteless

1. Pure water is..................

2. ................. cannot grow without water.

3. The water of wells, tubewells, submersible pumps, hands pumps, etc. is called ..................

4. Water good for drinking is called ................... .

5. About ............. of the Earth's surface is covered with water.

6. Dirty water is called .................. .

7. Conversion of water into ice is called .................. .

8. Ice when turns into liquid water is called .............. .

Ques.D. Name the following -

1. Large water bodies

2. Small water bodies

3. Three sources of water

4. Chief source of water

5. Sources that provide as underground water

Ques. E. Write T for True and F for the False statements -

1. Lakes are bigger collection of water than pond.

2. Sea water is safe for drinking.

3. We use electricity to draw out underground water.

4. We get filtered water from a tubewell.

5. Water from open well is safe for drinking.

6. Underground water is brought out for use by hand pumps, wells and tube wells.