Volcanic crater

A volcanic crater is an approximately circular depression in the ground caused by volcanic activity.[1] It is typically a bowl-shaped feature within which contains either multiple vents or a singular vent. During volcanic eruptions, molten magma and volcanic gases rise from an underground magma chamber, through a tube-shaped conduit, until they reach the crater's vent, from where the gases escape into the atmosphere and the magma is erupted as lava. A volcanic crater can be of large dimensions, and sometimes of great depth. During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.

Craters on Mount Cameroon
The volcanic crater of a Tangkuban Parahu mount, Bandung, Indonesia

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