Answer:
The
water cycle is the journey water takes as it circulates from the land to the sky
and back again. It involves the following steps:
(i) The Sun's heat provides the energy for evaporation of water from the Earth's
surface (oceans, lakes, rivers, etc.)
(ii) Plants also lose water into the air by the process of
transpiration.
(iii) Wind carries the moisture laden air. The water
vapour eventually condenses forming tiny droplets in clouds. When clouds meet
cool air over the land, precipitation (rain, hail or snow) is triggered and
water returns to the land in the form of rainfall.
(iv) All water that falls on the land does not immediately
flow back into the sea.
Some water seeps into the ground. Some of the underground
water is trapped between rocks or clay layers. This is called ground water.
Some of this ground water finds its way to the surface through springs. We also
bring the ground water to the surface for our use through wells or tube wells.
Water is also used by terrestrial animals and plants for
various life processes.
Most of the water flows down the hills as run offs (above
the ground or underground), eventually returning to the seas as slightly salty
water.
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