1. Top crust (Crust) is the outer skin covered virtual world. Can be divided into 2 areas: crust refers to the continent as part of continental land consists of all the elements Silicon (Si), aluminum (Al) is mainly? Mean crust part was covered with water, consisting of the elements Silicon (Si), magnesium (Mg) is mostly a depth from 5 km in the ocean until 70 km in the area below the towering mountains.
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