Question

Scientist have measured that the vibrations of an earthquake travel faster through solid rocks in the Earth and slower in the liquid magma deep in the Earth.

This data supports the idea that
A.
magma causes more earthquakes to happen than solid rock.
B.
solid rock can stop an earthquake from doing damage to a city.
C.
vibrations travel at the same speed in all materials.
D.
vibrations move through different materials at different speeds.

Answer 1

D. Vibrations move through different materials at different speeds.

Explanation: The observation that seismic vibrations travel faster through solid rock and slower through liquid magma shows wave speed depends on the material's properties (rigidity, density). The other choices are not supported by that data.