Question

causes volcanic eruption

Answer 1

Magma rises through cracks or weaknesses in the Earth's crust. When this pressure is released, eg as a result of plate movement, magma explodes to the surfacecausing a volcanic eruption. The lava from the eruption cools to form new crust. Over time, after several eruptions, the rock builds up and a volcano forms.

Answer 2

1. Earthquakes

2. Pressure of other fluids inside earth.

3. High pressurised steam and magma inside earth