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Picture of the day

Landscape in the Carpathian Biosphere Reserve, Zakarpattia Oblast, Ukraine

Media of the day

A caldera is a large, usually circular volcanic depression formed when magma is withdrawn or erupted from a shallow underground magma reservoir. It is often difficult to visualize how calderas form. In the video a simple experiment using flour, a balloon, tubing, and a bicycle pump provides a helpful visualization to help explain caldera formation.

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