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it is called a caldera a caldera is formed when a volcano erupts and it it such a big eruption that the volcano has no magma left in its chamber and since there is nothing left to support it, it caved in on itself.

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Related Questions

What is the huge hole left behind from a collapsed volcano called?

A caldera


What is the large circular depression at the top of a volcano that forms when the roof of the magma chamber collapses?

The large circular depression at the top of a volcano that forms when the roof of the magma chamber collapses is called a caldera. Calderas can be huge in size and are formed during explosive volcanic eruptions or when the magma chamber empties and the summit collapses into the void left behind.


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What is a huge hole in a surface?

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Do volcanoes explode?

If, however, you mean erupt rather than explode then it's something like: Magma beneath the volcano comes under very high pressure, which forces it out the volcano, normally through the huge gaping hole at the top. However, very high pressure sometimes means that this hole is not enough, and magma (lava when outside the volcano) will burst out the sides of the volcano, such as the eruption at St. Helens. I don't know much about science however, I don't know why or how the magma comes under pressure in the first place.


What does lava do after it is shot out of a volcano?

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How big is Krackatoa?

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