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Crust in geology is defined as the outermost solid surface of a planet or other celestial body in the universe. To compare, the Earth's crust is like the skin of an apple. Meaning, it is so thin compared with the other parts of the Earth.
The Earth's crust is generally consisting of compounds from the elements like oxygen, silicon, aluminum and some of the IA and IIA metals. The rocks are made up of silicates and oxides which are formed in different manner. Silicates are abundant in all the types of rocks that are present in the crust.
Here are the list of first 10 abundant elements in the crust. (Source: Wikipedia)
Another list of oxides found in the Earth's crust (Source: Wikipedia)
- SiO2 60.6%
- Al2O3 15.9%
- CaO 6.4%
- MgO 4.7%
- Na2O 3.1%
- Fe as FeO 6.7%
- K2O 1.8%
- TiO2 0.7%
- P2O5 0.1%
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