You are presented with the question "What causes tremors?" and the following answer choices: 
- thunder
 - Electrical energy
 - fire
 - faulting of rocks
 - sensory neurons
 - energy of moving objects
 - tornadoes
 - electromagnetic energy

Now knowing that faulting of rock in Earth 's crust causes earthquakes and earthquakes tremors both mild and moderate are frequent occurrences in the park and preserve, choose the best answer.


 

    faulting of rocks     