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The water cycle is the only way that Earth can be continually supplied with fresh water. The heat from the sun is the most important part of renewing our water supply.
This heat soaks up water from the oceans, lakes, rivers, trees and plants in a process called evaporation.
As the water mixes with the air it forms water vapor. As the air cools, the water vapor forms clouds. This is called condensation.
Most of the water is immediately returned to the seas by rain (precipitation). The rest of the water vapor is carried inside clouds by wind over land where it rains or snows.
Rain and melted snow is brought back to the oceans by rivers, streams, and run-off from glaciers and water underground.
Here is an illustration of how the water cycle works!
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