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Practice Reading: Fill in the Blanks (Dropdown)
ID: #49465
Hydrosphere
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Water is the most abundant substance at the surface of Earth. About 1.4 billion cubic km (326 million cubic miles) of water in and frozen form make up the oceans, lakes, streams, glaciers, and groundwaters found there. It is this enormous volume of water, in its various , that forms the discontinuous layer, enclosing much of the terrestrial surface, known as the hydrosphere. Central to any discussion of the hydrosphere is the concept of the water cycle (or hydrologic cycle). This cycle consists of a group of reservoirs containing water, the processes by which water is from one reservoir to another (or transformed from one state to another), and the rates of transfer associated with such processes. These transfer paths penetrate the entire hydrosphere, upward to about 15 km (9 miles) in Earth’s atmosphere and downward to depths on the order of 5 km (3 miles) in its crust.
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