C. nitrogen
Nitrogen is one of the primary gases in Earth's atmosphere, making up about 78% of it. Carbon dioxide and argon are also present but in smaller amounts, while helium is a trace gas and not considered one of the primary atmospheric gases.
Which of the choices below is one of the primary gases found in the atmosphere?
A.
carbon dioxide
B.
argon
C.
nitrogen
D.
helium
1 answer