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Mechanical Layers of the Earth- how do scientists figure out the compositions/states of each layer?

By: Guest
Date: Mon-Sep-24-2012-
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The state of matter can be figured out by what kind of seismic waves go through it, as explained in the video. The composition of the mantle is known from magmas that originate in the mantle, as well as from xenoliths, which are small fragments of mantle material incorporated into magmas that you can find in some volcanic rocks. The composition of the core is inferred from the density and other physical properties that can be figured out from seismic properties. 
Sal also talked about the differentiation of earth into different layers. We know the original composition of the whole earth before differentiation from primordial meteorites. If the subtract the composition of the crust and the mantle, we are left with the composition of the core.
[d] By: Guest
Date: Mon-Sep-24-2012
Response
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