Question

what are the main causes of volcanic activity?

Answer 1

1. mining
2. human activitys
3. natural disasters

Answer 2

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 surface causing 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.