The three abundant elements in the earth's crust are aluminium, oxygen and silicon. The correct order of their abundance is

The three abundant elements in the earth's crust are oxygen, silicon, aluminium. The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%. Other elements occur at less than 0.15%.