Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Environmental Science Fundamentals of Environmental Sciences
The elemental composition of Earth's crust in the descending order of weight percent is:
1
Silicon > Aluminium > Iron > Calcium
2
Aluminium > Iron > Calcium > Silicon
3
Iron > Calcium > Silicon > Aluminium
4
Calcium > Silicon > Aluminium > Iron