If the movement of two things that come together in San Andreas causes volcanic eruptions, then what causes volcanic eruptions?

Answer choices:
- a hemisphere is tilted away from the sun
 - high-mass stars collapsing
 - tectonic plates being pushed together
 - Two things found in Florida
 - Two things that come together in San Andreas
 - Two things found in Washington DC
 - Sudden shaking of the ground.
 - Two things found in Manhattan

 

     Two things that come together in San Andreas     