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The hydrosphere is the total mass of water on, under, and over the surface of a planet. It is part of physical geography.

The total mass of the Earth’s hydrosphere is about 1.4 × 1024 grams, which is about 0.023% of the Earth’s total mass. Around 2 × 1019 grams of this is the Earth’s atmosphere. In addition, 71% of the Earth’s surface, an area of 361 million square kilometers, is covered by ocean.[1]

References[change | change source]

  1. World Water Resources: a new appraisal and assessment for the 21st century (Report). UNESCO. 1998. [1]