Question

1. why do earthquakes usually occur at plate boundaries? because the stress on rock is greatest at plate boundaries because of the magnetic qualities of the plates because of gravity pushing down on the plates because stress on the rocks is least at plate boundaries

Explanation:

Earthquakes occur due to the release of stress - related energy. At plate boundaries, the stress on rocks is highest as plates interact (converge, diverge, or slide past each other), causing rocks to break and release energy in the form of seismic waves. Magnetic qualities, gravity pushing down, or low stress at boundaries are not the main reasons for earthquake occurrence.

Answer:

because the stress on rock is greatest at plate boundaries