Question

how  volcanoes are erupted

Answer 1

volcanoes are erupted due to the movement of tectonic plates beneath the earth..And the pressure made by it...

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Answer 2

Volcanoes erupt due to density and pressure . The lower density of magma relative to the surrounding rocks cause it to rise . It will rise to the surface or to a depth that is determined by the density of magma and the weight of rocks above it.