move through different materials. are pulled by the force of gravity. lose energy to surrounding rocks. reflect off of boundaries.
I gave my students this multiple choice question: When an earthquake occurs, the speed of the seismic waves changes as they

Only one answer is correct among these 4 choices:
- move through different materials.
- are pulled by the force of gravity.
- lose energy to surrounding rocks.
- reflect off of boundaries.

Could you tell me which one is correct?

move through different materials.