In contrast to the outer solid mantle, parts of the central regions of Earth's interior are thought to be fluid because

a. P seismic waves cannot make it through those regions.
b. S seismic waves cannot make it through those regions.
c. neither P nor S seismic waves can make it through those regions.
d. both P and S seismic waves easily make it through those regions.


b

Physics & Space Science

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