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

Fact 2: Fault zones are plates in the earth that slide and collide.

Given the two facts above, answer the question "plates in the earth do what which causes earthquakes" with the following options: 
- Movement
 - waves
 - heat
 - collide
 - moves
 - erosion
 - break off
 - friction


 

    collide     