Question

most of the earths air mass is found in the atmospheric layer closest to the earths surface.
identify the gas that is most abundant in this region, which comprises 78% of the air.
choose 1 answer:
a carbon dioxide
b nitrogen
c oxygen
d water vapor

Explanation:

The atmospheric layer closest to the Earth's surface is the troposphere. In the Earth's atmosphere, nitrogen (\(N_2\)) makes up about 78% of the air, oxygen (\(O_2\)) about 21%, carbon dioxide (\(CO_2\)) a very small fraction (around 0.04%), and water vapor varies but is much less than 78%.

Answer:

B. nitrogen