refraction of waves generation of new waves transformation of transverse waves into longitudinal waves transformation of mechanical waves into electromagnetic waves
I gave my students this multiple choice question: Which seismic wave phenomenon, found at structural boundaries, allows scientists to interpret the interior structure of Earth?

Only one answer is correct among these 4 choices:
- refraction of waves
- generation of new waves
- transformation of transverse waves into longitudinal waves
- transformation of mechanical waves into electromagnetic waves

Could you tell me which one is correct?

refraction of waves