Page 102 - EVS Class 04

world. They are– Pacific, Atlantic, Indian, Arctic and Antarctica oceans. Pacific

ocean is the largest ocean in the world. A sea is also a large waterbody, but
smaller than an ocean. There are many seas in the world.

The water present in the seas and oceans is salty and not fit for drinking.

Name the oceans and seas that surrounds the Indian subcontinent.
Oceans
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Seas
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Storing Water

Though rain is the major source of water, but it does not rain throughout
the year. So, we need to store and conserve water. This is done by building
dams, canals and reservoirs .

Dam Canal Reservoir
Dam

A dam is a wall built across a river to hold back or block the flow of river
water. This water is stored and used to generate electricity, irrigate fields and
even for domestic purposes.

Canal

A canal is a channel of water taken from a river and used to irrigate the
fields.

Reservoir

A reservoir is an artificial or man-made lake built behind a dam to store the
blocked water of the river. Later, this stored water is used for various

activities.

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