You are presented with the quiz "What causes volcanic eruptions?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the movement of tectonic plates causes volcanic eruptions" and "plate techtonics could be defined as the movement of the earth's sections or plates as a result of convectional forces below the surface". 

So, what's the best answer to the question?


 

     Tectonic plates moving      