Page "Volcanic crater" Paragraph 3
from
Wikipedia
It is typically a basin, circular in form within which occurs a vent ( or vents ) from which magma erupts as gases, lava, and ejecta.
During certain types of climactic eruptions, the volcano's magma chamber may empty enough for an area above it to subside, forming what may appear to be a crater but is actually known as a caldera.
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