Chemical composition of the crust : oxygen (46%), silicon (28%), aluminum (8%), iron (5%), calcium (4%), sodium (3%), potassium (3%), magnesium (2%) and other elements (1%).
Chemical composition of the crust : oxygen (46%), silicon (28%), aluminum (8%), iron (5%), calcium (4%), sodium (3%), potassium (3%), magnesium (2%) and other elements (1%).