Question

what are the causes of volcanic eruption

Answer 1

A pressure change that occurs within the volcano forces the magma to overflow the chamber.

The common causes of volcanic eruptions are :

1. A movement of tectonic plates which is the most common reason for a volcano eruption.

2. Another kind is when the plates move away from each other allowing magma to rise and fill the gap.

3. Finally, a decrease in external pressure can trigger an eruption.

Answer 2

Explanation:

Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust. A build up of pressure in the earth is released, by things such as a plate movement which forces molten rock to exploded into the air causing a volcanic eruption.