NCERT Textbook - Water: A Precious Resource Class 7 Notes | EduRev

General Science(Prelims) by IRS Divey Sethi

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UPSC : NCERT Textbook - Water: A Precious Resource Class 7 Notes | EduRev

 Page 1


Water: A Precious Resource
16
You are perhaps aware that 22 March is
celebrated as the world water day! A
school celebrated ‘water day’ and invited
posters from the children of your age
group. Some of the posters presented
on that day are shown in Fig. 16.1.
“
Jal Hai, To Kal Hai
”
“If you have water, you can think of the future”
teachers must very often be advising you
not to waste water. No wonder we
celebrate water day every year to attract
the attention of everybody towards the
importance of conserving water.
The amount of water recommended
by the United Nations for drinking,
washing, cooking and maintaining proper
hygiene is a minimum of 50 litres per
person per day. This amount is about
two and a half buckets of water per
person per day. Is your family getting at
least this much of water? If yes, you
should consider yourself fortunate
because millions of people in our
country do not get enough water. What
about your friends and their families?
Share your experience with them.
In some places there is an acute
shortage of water. Taps running dry,
long queues for water (Fig. 16.2), fights,
marches and protests for demand of
water have become a common sight,
especially during summers. Some of the
newspaper clippings shown in Fig. 16.3
clearly indicate this message. Is it not
true that we face acute shortage of
water?
Fig. 16.1  Collage of posters
What is the message you get from
these posters? Write your observations
in your notebook and discuss them in
the class.
Have you ever felt a shortage of water
at home or at school? Your parents or
© NCERT
not to be republished
Page 2


Water: A Precious Resource
16
You are perhaps aware that 22 March is
celebrated as the world water day! A
school celebrated ‘water day’ and invited
posters from the children of your age
group. Some of the posters presented
on that day are shown in Fig. 16.1.
“
Jal Hai, To Kal Hai
”
“If you have water, you can think of the future”
teachers must very often be advising you
not to waste water. No wonder we
celebrate water day every year to attract
the attention of everybody towards the
importance of conserving water.
The amount of water recommended
by the United Nations for drinking,
washing, cooking and maintaining proper
hygiene is a minimum of 50 litres per
person per day. This amount is about
two and a half buckets of water per
person per day. Is your family getting at
least this much of water? If yes, you
should consider yourself fortunate
because millions of people in our
country do not get enough water. What
about your friends and their families?
Share your experience with them.
In some places there is an acute
shortage of water. Taps running dry,
long queues for water (Fig. 16.2), fights,
marches and protests for demand of
water have become a common sight,
especially during summers. Some of the
newspaper clippings shown in Fig. 16.3
clearly indicate this message. Is it not
true that we face acute shortage of
water?
Fig. 16.1  Collage of posters
What is the message you get from
these posters? Write your observations
in your notebook and discuss them in
the class.
Have you ever felt a shortage of water
at home or at school? Your parents or
© NCERT
not to be republished
SCIENCE 194
Activity 16.1
Collect clippings from newspapers and
magazines on the news items, articles
and pictures related to water shortage.
Paste them in your scrapbook and share
it with your friends. List some problems
faced by the people and discuss them
in the class.
Water shortage has become a matter
of concern throughout the world. It is
estimated that in a few years from now
Fig. 16.4  Earth appears blue from space
Fig. 16.2  Long queue for water
Fig. 16.3  Newspaper clippings
Year 2003 was observed as
the International Year of
Freshwater to make people
aware of this dwindling natural resource.
more than one third of the people in
the world could face water scarcity.
Before we discuss why water is
getting scarce we must know how much
water is available for use on our planet.
16.1 HOW MUCH WATER IS AVAILABLE
Look at the picture of the earth taken
from space. Why does it appear blue?
Surely, you can guess!
You are aware that about 71% of
the earth’s surface is covered with
water. Almost all the water on the
earth is contained in the seas and
oceans, rivers, lakes, ice caps, as
groundwater and in the atmosphere.
However, most of this water is not fit for
human consumption. The water that is
fit for use is freshwater. Perform the
© NCERT
not to be republished
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