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

Answer: Option C

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%.