Hydrosphere (or sea) covers five-sevenths
or more accurately 70.78% (36,10,59,226 sq. km) of the total surface area of
the earth.
Water is freely available in the gaseous,
liquid and solid state.
It is necessary for carrying out chemical
reactions within the bodies of the living organism.
Water also dissolves and transports
nutrients from the soil to the pants.
It is used by plants for making food.
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