What do you call a bowl-shaped depression at the mouth of a volcano or geyser?

Answer

A bowl-shaped depression that is at the mouth of a volcano or geyser is called a volcanic crater. These craters are caused by the volcano's activity. It is a vent at the top of a volcano that releases gases, lava and ejecta.
1 Additional Answer
The bowl shaped depression at the mouth of a volcano is geyser is called the crater.This can also be described as a pit as well as bowl of cup shaped. The crater is where you will find dark material that has formed.
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