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Grand Prismatic Spring
This spring can reach temperatures of 86 degrees C (188 degrees F). Tiny living things, such as algae and bacteria, live in the spring.
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Licancabur Volcano
This volcano has Earth's highest lake. It's almost 6,100 meters (20,000 feet) high. Tiny living things, such as plankton, live in the lake.
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Matanuska Glacier, Alaska
This cave is made of ice. It is extremely cold. Only microscopic living things can live here.
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