Answer: stress caused by plate movement
Explanation:
Earthquakes are caused by the movement of tectonic plates, the different types of movements being divergent, convergent and transform.
Divergent boundaries: where new crust is generated as the plates pull away from each other.
Convergent boundaries: where crust is destroyed as one plate dives under another.
Transform boundaries: where crust is neither produced nor destroyed as the plates slide horizontally past each other.
