Hydrosphere is the combined name (for the study purpose) given to all the water bodies found on the Earth’s surface, for example, Oceans, Rivers, Lakes, etc.
About 71% of the Earth’s surface is covered by water and rest is covered by landmass.
About 97.5% (of total hydrosphere) is saline water and rest 2.5% is fresh water.
About 68.7% of the fresh water is available in the form of permanent snow found in the regions of Arctic, Antarctic, and other mountain glaciers.
About 29.9% fresh water is available in the form of (fresh) groundwater.
Only about 0.26% fresh water is easily accessible for the use, available in the form of rivers, lakes, reservoirs, etc.
There are five Oceans namely −
Arctic Ocean &
The following table describes the major facts of all the five Oceans −
|Ocean||Area (sq. km)||% of Total||Avg. Depth (in meter)||Deepest Point|
|Pacific Ocean||168,723,000||46.6||3,970||Mariana Trench (10,994 m deep)|
|Atlantic Ocean||85,133,000||23.5||3,646||Puerto Rico Trench (8,648 m)|
|Indian Ocean||70,560,000||19.5||3,741||Diamantina Trench (8,047 m) Sunda Trench (7,725 m)|
|Arctic Ocean||15,558,000||15,558,000||1,205||Eurasian Basin (5,450 m)|
|Southern Ocean||21,960,000||6.1||3,270||South Sandwich Trench (7,236 m)|