The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. Below is the percent of what oxides make up the earth's crust:

SiO2 59.71
Al2O3 15.41
CaO 4.90
MgO 4.36
Na2O 3.55
FeO 3.52
K2O 2.80
Fe2O3 2.63
H2O 1.52
TiO2 0.60
P2O5 0.22
total 99.22

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