Fact 1: Faulting of rock in Earth 's crust causes earthquakes.

Fact 2: Earthquakes are caused by fault movement.

Given the two facts above, answer the question "what are responsible for earthquakes?" with the following options: 
- flow of electrons
 - fault movement
 - heat energy
 - Energy.
 - volcanos
 - magma
 - Movement
 - lava


 

  fault movement       