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this page? |
You
can watch a video and learn about the water cycle. |
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watch this video? |
- Make sure the SOUND on your computer
is turned on
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| More cool
stuff |
Earth's
water is always in movement, and the water cycle, also known
as the hydrologic cycle, describes the continuous movement
of water on, above, and below the surface of the Earth.
Since the water cycle is truly a "cycle," there is no
beginning or end. Water can change states among liquid,
vapor, and ice at various places in the water cycle, with
these processes happening in the blink of an eye and over
millions of years.
Although the balance of water on Earth remains fairly
constant over time, individual water molecules can come and
go in a hurry. The water in the apple you ate yesterday may
have fallen as rain half-way around the world last year or
could have been used 100 million years ago by Mama Dinosaur
to give her baby a bath. |
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Source: Environmental Protection Agency |
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