Final answer:
A crater is the feature created on the exterior of a volcano when it erupts.
Step-by-step explanation:
When a volcano erupts, a feature created on its exterior is the crater. A crater is a bowl-shaped depression at the top of the volcano formed due to the explosive release of volcanic materials, such as ash, rock fragments, and gases. It is formed when the pressure from the magma chamber below is released violently.
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