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Water
Edu-Primes
Follow
8/29/2024
Category
📚
Learning
Transcript
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00:00
Water Water is the primary need of mankind.
00:08
We cannot live without water.
00:12
Plants and animals also need water.
00:15
Now let us study the importance of water in this chapter.
00:22
Water Water covers about three-fourth of the earth's
00:26
surface.
00:27
Oceans, rivers and lakes are the main sources of water.
00:37
Forms of Water Water exists in three forms, namely ice, water
00:44
and water vapour.
00:47
On heating water changes into water vapour.
00:55
And on cooling it changes into ice.
01:00
Water and water vapour do not have a fixed shape.
01:05
Ice has a fixed shape.
01:08
Sources of Water We get water from different sources, like
01:13
rain, rivers and lakes, streams, ponds, hand pumps, taps, wells and tanks.
01:28
Purposes of Water Water is useful to us in many ways.
01:33
We use water for many purposes, like drinking, cooking, bathing, to wash away dirt.
01:42
And water is needed for the plants to grow healthy and look fresh.
01:50
Water Cycle The water vapour goes up into the air and
01:55
cools to form tiny water droplets.
01:59
These tiny droplets join to form clouds.
02:04
When the water drops become heavy, they fall down as rain.
02:09
And again it goes up as water vapour.
02:15
Water Supply at our Homes In cities we get water from the public water
02:21
supply system through pipes.
02:24
The water is drawn from rivers and lakes and purified in water houses.
02:30
The purified water is collected in huge tanks and from these tanks water is supplied to
02:37
our homes with the help of pipes.
02:41
In India many villages do not have taps.
02:45
So the people depend on wells, tube wells and hand pumps for water.
02:53
Storing Water At home the water from the taps is collected
02:59
in buckets, jugs and bottles.
03:02
The water must be collected in a clean vessel and it should be covered.
03:08
If we still find that the water is not clean, we can boil it.
03:16
Wasting and Polluting Water Do we really waste water?
03:21
Yes!
03:22
We see that people waste a lot of water while brushing, washing their face or while washing
03:29
vegetables.
03:32
Wastage of water should be avoided at all costs.
03:36
Our rivers are also polluted by waste from factories, bathing animals, washing clothes,
03:43
throwing waste from homes etc.
03:46
So we should be careful about water and we should never waste and pollute water.
03:54
Summary Water covers three-fourth of the earth's surface.
04:01
Water is found in three forms – ice, water and water vapour.
04:08
Water can be changed from one form to another.
04:12
The water cycle goes on in nature.
04:16
The water must be collected in a clean vessel and it should be covered.
04:24
polluted by waste from factories, bathing animals, washing clothes etc.
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