Circular depression around a volcanic vent

A volcano crater is a circular depression around a volcanic vent.
Etna volcano is located on the territory of the state...
Mount Etna, or simply Etna, is an active stratovolcano on the east coast of Sicily, Italy, in the Metropolitan City of Catania, between the cities of Messina and Catania.
What is a volcanic bomb?
A piece of consolidated lava with a diameter greater than 10 cm They cool into solid fragments before reaching the ground
What is lava?

Lava is molten or partially molten rock that has been expelled from the interior of a terrestrial planet or a moon onto its surface.
Which type of volcano has not erupted for 2000 years?
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