Water As A Resource


 
 
Concept Explanation
 

Water As A Resource

Water is a natural resource that is vital to the presence of life on Earth. Water exists in abundance on our planet Earth. However, only a very small fraction of it is fit for human consumption.

Most of the water that exists on Earth is in the seas and oceans. Sea and ocean water are highly salty and hence unfit for drinking. Most of the fresh water is frozen in the glaciers in the polar ice caps, and is thus not readily available.

Water in different forms : 

 Water exists in three different forms  : solid, liquid ans gas.

  • The polar region of earth and mountains have ice. Air contains water vapours which is the gaseous state of the water. The three forms of water are interchangeable. 
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    Sample Questions
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    Question : 1

    Which of the following are correct ?

    (a) Water is a basic necessity for all forms of terrestrial and aquatic animals. It is available in the form of several water bodies like oceans, lakes and ponds.

    (b) Regulation of use of water stored in dams is a way to manage the water resources

    Right Option : C
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    Question : 2

    The percentage of Earth's surface covered by water is _________________

    Right Option : B
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    Question : 3

    Which of the following are correct ?

    (a) Rain is a very important source of water. 

    (b) The high yielding varieties of crops require much amount of water for irrigation.

    (c)  Himachal Pradesh had evolved a local system of canal irrigation called Kulhs over four hundred years ago. 

    Right Option : D
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