Earth Elements
24
Apr/080
Apr/080
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Safari LTD Periodic Table of the Elements Poster List Price: $21.99 Sale Price: $9.54  |
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(24x36) Laminated Periodic Elements Educational Poster |
Why are atomic elements distributed differently in the crust than the earth's interior?
We know that, for example, felsic rocks are from the continental crust partially because the crust is mostly silica, aluminum, and oxygen, whereas we know ultramafic rocks are from the deep earth because the earth's interior is mostly iron, magnesium, and nickel.
But why? Why are Silica and associated elements in the crust, and why are iron and associated elements in the interior?
It's a matter of density. When the whole earth was molten the lighter elements would have floated on the denser ones. The Earth cooled from the outside inwards. Simple as that.
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