TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Geothermal pool. View of a geothermal (hot) pool in Yellowstone National Park, Wyoming, USA. The pool is heated by hot rocks beneath it. The bright colours come from minerals deposited around the pool, and from colonies of heat-loving bacteria and algae. Areas such as this are volcanic in nature. The rocks are hot due to the presence of magma (molten rock) beneath the surface. Yellowstone National Park is the oldest National Park in the USA, and contains thousands of geysers and hot pools such as this one.
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