Earth’s crust is made up of mostly which two elements?
The two most abundant elements in the earth's crust are Oxygen and Silicon.
Oxygen is the most abundant element in the Earth's crust. The crust is 46.6% Oxygen by weight.
The second most abundant element is Silicon at 27.7% by weight.
Other elements in decreasing order of abundance are Aluminium, Iron, Calcium, Sodium, Potassium and Magnesium.