Seismic Waves Inside Earth

Multiple Choice

Seismic waves inside Earth

A) travel at a constant speed but change direction (refract) as they travel through materials of different densities or compositions.
B) travel at different speeds in materials of different densities or compositions and change direction (refract) as they move from one material to another.
C) travel in straight lines with speeds that change as the waves move through materials of different densities or compositions.
D) always travel in a straight line at a constant speed.