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Oxygen
Abundances of the Elements in the Earth's Crust
Element Approximate % by weight
Oxygen 46.6
Silicon 27.7
Aluminum 8.1
Iron 5.0
5 more rows
Element Abundance in Earth's Crust - HyperPhysics
hyperphysics.phy-astr.gsu.edu/hbase/tables/elabund.html