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%

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