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because that is where the massive chambers full of magma are

the pressure of the magma keeps building up under the crust till it cant take it any more and it erupts :)

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11y ago
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11y ago

When the density of magma is lower then surrounding solid rock, it is forced toward Earth's surface.

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10y ago

Lava is molten rock, and is still close to the same density as the rock that it will form into when it cools. As common experiance shows, rock is denaser than water, and thus it sinks.

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12y ago

it stay underground for 4 months.

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Q: Why does lava stay underground before erupting?
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