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

Fact 2: Thrust faults are a result of compressional forces in the Earth's crust.

Given the two facts above, answer the question "What causes earth quakes?" with the following options: 
- electromagnetic energy
 - movement
 - harmful substances
 - the force
 - shaking
 - compressional forces
 - Water expanding
 - energy of moving objects


 

      compressional forces   