Question

What is the science behind an earthquake?

Answer 1

The earth has four major layers: the inner core, outer core, mantle and crust.

Explanation:

The plate boundaries are made up of many faults, and most of the earthquakes around the world occur on these faults. Since the edges of the plates are rough, they get stuck while the rest of the plate keeps moving. Finally, when the plate has moved far enough, the edges unstick on one of the faults and there is an earthquake.

Source: http://earthquake.usgs.gov/learn/kids/eqscience.php