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The earth has three main chemical layers: a core, mantle, and crust. These layers formed from a process called _____ during planetary accretion. A. differentiation B. accretion C. condensation D. mixing

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meerkat18
The process of forming the iron - rich core, the low density crust which is also rich in silicon, oxygen, aluminum, and the intermediate density mantle rich in silicon, oxygen, and magnesium is called the differentiation. Thus, the answer to this item is letter A. 
oopsydaisy
The chemical layers of Earth are formed from the process called differentiation during planetary accretion. The Earths three main chemical layers are the core, crust, and the mantle. 

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