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.
References[change | change source]
- World Water Resources: a new appraisal and assessment for the 21st century (Report). UNESCO. 1998.