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Cracks or weaknesses allow magma to rise to the Earth's crust, pressure builds up and the magma explodes!
When plates collide they crack open separation of the plates causes heat. The plates are pushed together and dragged apart in constructive or destructive boundaries.
Deep underground rocks are hot and semi-solid. Water would only cool them down. This is the magma chamber.
There is lower density of magma related to the surrounding causes it to rise.
The volcanic materials erupt through the main vent. But, the magma may break through the lead-out wall branch out into smaller carriers and escape through vents inside the volcanoes.