a funnel shaped vent at the top of a volcano is a crater
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A cinder cone volcano
Vent .
The opening in or near a volcano is called a crater. It is a bowl-shaped depression where lava, gases, and volcanic ash can erupt from the Earth's crust.
The top pit of a volcano is called the crater. It is the opening at the summit of the volcano where volcanic activity such as eruptions and gas emissions occur.
A volcanic vent or fissure (depending on the type of eruption).