The third most plentiful gas in the Earth's lower atmosphere is ________.
A) nitrogen
B) oxygen
C) argon
D) neon
E) helium

Name: The third most plentiful gas in the Earth's lower atmosphere is ________. A) nitrogen B) oxygen C) argon D) neon E) helium
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The Earth's lower atmosphere (troposphere) consists mostly of nitrogen (78%) and oxygen (21%). The third most plentiful gas is argon, which makes up around 0.9% of the atmosphere. Neon and helium are present in even smaller amounts.

The Third Most Plentiful Gas in the Earth's Lower Atmosphere