You are presented with the question "what are responsible for earthquakes?" and the following answer choices: 
- flow of electrons
 - fault movement
 - heat energy
 - Energy.
 - volcanos
 - magma
 - Movement
 - lava

Now knowing that faulting of rock in Earth 's crust causes earthquakes and earthquakes are caused by fault movement, choose the best answer.


 

  fault movement       