SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration showing the formation of a caldera. At top a full magma chamber under pressure causes eruption. Second from top, magma chamber is now partially emptied and pressure is released. Third from top, volcano collapses into top of the magma chamber beginning to form the caldera. At bottom, large crater forms with a steep rim and fills with water.
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