at 2800 degrees F, iron (+nickel) melted
dense liquid iron (+nickel) sank to form core which cause chemical differentiation
chemical differentiation: lighter elements rise, denser elements sink
result: earth has layers
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earth has 3 layers that are each chemically distinct
crust
mantle
core
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abundant silicate minerals (composed of SiO4 groups)
relatively rich in potassium (K) +sodium (Na)
least dense
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abundant iron (Fe) + magnesium (Mg)
some silicate minerals (minerals composed of SiO4 groups)
more dense than crust, less dense than core
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mostly iron (Fe) + nickel (Ni)
most dense
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continental crust:
oceanic crust
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uppermost mantle and crust (chemical layers)= lithosphere (mechanical layer)
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