During the process of mountain building, earthquakes sometimes occur along continental-continental convergent boundaries.
Which statement best describes the motion of the plates along these boundaries that causes the earthquakes?
The plates push apart from each other with no subduction.
Subduction occurs with the less-dense plate sinking below the other plate.
Subduction occurs with the more-dense plate sinking below the other plate.
The plates smash together with no subduction.

Subduction occurs with the more-dense plate sinking below the other plate.

Explanation:

Subduction is a process which occurs at the convergent boundaries of tectonic plates where one plate moves below another tectonic plates and is forced to sink due to high gravitational energy into the mantle. Those areas where Subduction occurs are called subduction zones. The plate which is more denser is present below the less dense tectonic plates during the process of Subduction.

the atomic mass is the bottom number on the element.

-steel jelly