Question

a circular opening in the earth crust from where volcano eruption is ejected​

Answer 1

Answer:

calderas

It ultimately collapsed into a pile of rubble after 11 months of growth. Some volcanoes experience such large, explosive eruptions that they release most of the material in their magma chamber. This causes the land around the erupting vent or vents to collapse inwardly, creating circular depressions called calderas.

Explanation:

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Answer 2

Answer:

‘A volcano is a vent, or opening, usually circular in form, through which heated materials consisting of gases, water, liquid lava and fragments of rocks are ejected from the highly heated interior to the surface of the earth.’

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