Question

The diagram shows a cross section of Earth and the layers of Earth's Interior. The diagram also shows the paths of earthquake waves moving

through Earth. These paths were determined by selsmographs detecting the various types of waves reaching points all around the surface of Earth
at different times.
SS
SKS
SKE
Source of
Earthquake
Surface waves
Inner Core
Outer Core
Lower Mantle
Upper Mantle
Crust
PKS
How were earthquake waves able to help geologists determine the different layers of Earth's interior?
O A. Waves traveled at different speeds through different substances Inside Earth.
O B. Geologists determined the depths of layers when the waves were reflected back to the source.
O c. Layers of Earth increased the amplitude of the earthquake waves making them easier to detect.
OD. Earthquake waves made the layers softer allowing geologists to drill shafts down to the inner layers.

Answer 1

B. Geologists determined the depths of layers when the waves were reflected back to the source.