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Volcanic craters are bowl-shaped depressions on the Earth's surface that are formed by volcanic activity. They are typically circular in shape and can vary in size from a few meters to several kilometers in diameter. Volcanic craters are created when magma rises to the surface and erupts, causing the surrounding rock and ash to collapse inward. They can be found on both land and underwater, and often contain a central vent or cone where the volcanic activity originates. Volcanic craters are important geological features that provide insight into the history of volcanic eruptions and can also hold valuable resources such as geothermal energy.