A seismologist plots the variation in velocity of Pand Swaves in different layers of the Earth during an earthquake. The information is shown in the graph.
15
P waves
10
Speed (km/s)
Swaves
Crust
Mantle
Outer core
Inner
core
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.
O P and S waves are absorbed in the core.
The layers of Earth do not have distinct boundaries.
O P and Swaves always originate in the mantle and travel through the core.
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