GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Desert flash flood. Block artwork showing how desert areas that go for months or years without rain can experience sudden flash floods due to heavy rainfall from clouds (upper right). The resulting water fills dry riverbeds, as shown here, providing water for dormant plant seeds and desert animals. In canyon areas, such flash floods are a hazard to visitors as flash flooding can occur without warning due to rain falling some distance away.
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