Question

what are the two most abundant gases in the earth crust

Answer 1

The Earth's crust is an extremely thin layer of rock that makes up the outermost solid shell of our planet. In relative terms, it's thickness is like that of the skin of an apple. It amounts to less than half of 1 percent of the planet's total mass but plays a vital role in most of Earth's natural cycles. 

% byweight

Oxygen46.6%

Silicon27.7%

Aluminium8.1%

Iron5.0%

All others12.6%

Answer 2

The two most abundant gases are silicon, and nitrogen