Question

Near Earth’s surface, ____ occupies about 78% and ____ about 21% of the total volume of dry air. a. hydrogen; oxygen b. nitrogen; oxygen c. oxygen; hydrogen d. nitrogen; water vapor

Answer 1

Answer: b. Nitrogen; Oxygen

Step-by-step explanation:

The air is a mixture of gases in the following percentage;

Nitrogen; 78%

Oxygen : 21%

Carbon(IV)Oxide : 0.03%

Argon : 0.9%

Others ( minute traces of Neon, Helium, Methane e.t.c) : 0.17%