Question

What are two causes of volcanic eruptions

Answer 1

Answer:

Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

Answer 2

Answer:

There are several different causes for a volcano to erupt which all fundamentally come down to a  pressure change within the volcano which forces the magma to overflow the chamber it is held in.

The most common type of eruption is caused by the movement of tectonic plates.