Hydrosphere

n. waters which cover the surface of the earth

A hydrosphere (Greek hydro means "water") in physical geography describes the collective mass of water found on, under, and over the surface of a planet.
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Noun
1. the watery layer of the earth's surface; includes water vapor
(hypernym) layer
(part-holonym) Earth, world, globe
(part-meronym) body of water, water

n. hydrosphere, waters which cover the surface of the earth

The part of the Earth composed of water including clouds, oceans, seas, ice caps, glaciers, lakes, rivers, underground water supplies, and atmospheric water vapor.