Fact 1: Tectonic plates being pushed together causes earthquakes.

Fact 2: Earthquake tremors and volcanic activity are frequent.

Given the two facts above, answer the question "what causes tremors?" with the following options: 
- tectonic plates coliding
 - fissures of hot, acidic water
 - sensory neurons
 - energy of moving objects
 - Thyroid-stimulating hormone
 - storms
 - the sun
 - richter scale


 

 tectonic plates coliding        