Question

How does a volcano erupt . Why?

Answer 1

Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth's mantle melts. ... If magma is thick, gas bubbles cannot easily escape and pressure builds up as the magma rises. When the pressure is too much an explosive eruption can happen, which can be dangerous and destructive.

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Answer 2

because it is lighter than the soild rock around it, magma rises and collects in magma chamber. when this type of magma erupts it flow out of the volcano. a good example is eruption it hawii valcano.