Relative Abundance of the Chemical Elements in the Earth System
The "Big Eight"
, which account for ~99% of the material in the Earth System:
Element
% by Weight
of Earth System
Oxygen
46.6
Silicon
27.7
Aluminum
8.1
Iron
5.0
Calcium
3.6
Potassium
2.6
Magnesium
2.6
Sodium
The Rest of the "Top Twenty"
: