The Water Cycle

Science Center Objects

The U.S. Geological Survey (USGS) offers you the most comprehensive information about the natural water cycle anywhere. We've developed Web pages aimed at both younger students and kids and at adults and advanced students, so choose your path below and begin learning.

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What is the water cycle?

Drippy - Water Science School

Let me introduce myself. I am Drippy, your host at the U.S. Geological Survey's Water Science School. And, what is the water cycle? I can easily answer that—it is "me" all over! The water cycle describes the existence and movement of water on, in, and above the Earth.

Earth's water is always in movement and is always changing states, from liquid to vapor to ice and back again. The water cycle has been working for billions of years and all life on Earth depends on it continuing to work; the Earth would be a pretty stale place to live without it.