refraction of waves generation of new waves transformation of transverse waves into longitudinal waves transformation of mechanical waves into electromagnetic waves
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which seismic wave phenomenon, found at structural boundaries, allows scientists to interpret the interior structure of Earth?
Possibilities:
- refraction of waves
- generation of new waves
- transformation of transverse waves into longitudinal waves
- transformation of mechanical waves into electromagnetic waves

refraction of waves