Question

What
are
the
eartquakes​

Answer 1

An earthquake is an intense shaking of Earth’s surface. The shaking is caused by movements in Earth’s outermost layer.
When do they occur?
Earthquakes occur when stress in earths crust build up too a point that causes the rocks to break

Answer 2

sudden and violent shaking of the ground, sometime causing large destructions- from movement of the earth's crust.