In a volume of air near Earth's surface today, ____ occupies 78 percent and ____ nearly 21 percent.
A)nitrogen; oxygen
B)hydrogen; oxygen
C)oxygen; hydrogen
D)nitrogen; water vapor
E)hydrogen; helium

Question

Quizplus · Accepted Answer

Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of the air by volume, while oxygen is the second most abundant, comprising nearly 21%.

In a Volume of Air near Earth's Surface Today, ____