Question

question 79
the atmosphere is approximately 80% ______ gas.
○ n₂
○ co₂
○ nh₃
○ h₂o

Explanation:

The Earth's atmosphere composition is a fundamental concept in natural science (specifically related to environmental sciences and general knowledge about the atmosphere). Nitrogen (\(N_2\)) makes up about 78 - 80% of the Earth's atmosphere. Carbon dioxide (\(CO_2\)) is a minor component (about 0.04% currently, though its levels are rising). Ammonia (\(NH_3\)) is not a major atmospheric gas in Earth's normal atmosphere (it can be present in trace amounts in some local environments like near industrial plants or in some planetary atmospheres like Jupiter's in larger amounts, but not Earth's general atmosphere). Water vapor (\(H_2O\)) varies in the atmosphere (from 0 - 4% approximately depending on temperature and location).

Answer:

\(N_2\)