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We know that the composition of the crust is SiAl and SiMa and the one of mantle is mostly ophiolites, but why? Which are the geological processes that make this difference exist?

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  • $\begingroup$ For a start. Crust has been differentiated from Mantle. en.m.wikipedia.org/wiki/Igneous_differentiation $\endgroup$ – Universal_learner Jun 22 at 18:28
  • $\begingroup$ By the way brucite is fairly common at Mantle. It is not all silicates. $\endgroup$ – Universal_learner Jun 22 at 18:33
  • $\begingroup$ An ophiolite is in fact an oceanic crustal fragment not part of the mantle at all. $\endgroup$ – Ash Jun 23 at 13:17
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Generally speaking , Earth interior is classified using two models , the mechanical and chemical model . the chemical model layers are crust , mantle and core. these layers organized while earth started to cool after formation at the stage known as planetary differentiation . heavier materials like Fe And Ni sunk to the core , while the lighter materials like Al and Si stayed at the outer surface of the ball . Read more about Planetary differentiation if you are interested

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