The earth's crust (English:Crust) is the outermost layer of earth structure has a thickness of between 60-70 kilometers divided into 2 types: continental crust (Continental. Crust) often have very thick with low density of ore, alumina and silica.Type sial (SIAL) and earth (ground Oceanic ocean Crust) often have a thickness of less than continental crust density. Because of the mineral, magnesia and silica. Call another name that ชั้นไซม (SIMA)
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