A seismologist plots the variation in velocity of P and Swaves in different layers of the Earth during an earthquake. The information is shown in the grap 15
P waves
(km/s)
Speed
S waves
Crust
16Mantle
Outer core
Inner
core
0
0
1,000
2,000
3,000
4,000
5,000
6,000
Depth (km)
What can be concluded from the graph?
The layers of Earth have different densities.
P and Swaves are absorbed in the core.
The layers of Earth do not have distinct boundaries.
Pand S waves always originate in the mantle and travel through the core.