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Composition of the Earth's Crust

Chemical makeup of the Earth's crust in percent of total crust volume.

Component
Symbol
Volume
Oxygen
O
46.6%
Silicon
Si
27.8%
Aluminum
Al
8.1%
Iron
Fe
5.0%
Calcium
Ca
3.6%
Sodium
Na
2.8%
Potassium
K
2.6%
Magnesium
Mg
2.0%
others
 
1.6%