Question

define hydrosphere....​

Answer 1

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The sphere of water is known as hydrosphere.

Organisms that live in hydrosphere are said to be aquatic.

Answer 2

All the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.

(Or)

A Hydrosphere is the total amount of water on a planet. The hydrosphere includes water that is on the surface of the planet, underground, and in the air. A planet's hydrosphere can be liquid, vapor, or ice. On Earth, liquid water exists on the surface in the form of oceans, lakes and rivers.

Hope it helps.......