Question

Earth's atmosphere is primarily composed of _____.

a. argon
b. oxygen
c. nitrogen
d. carbon dioxide user: air pressure _____ with elevation.
a. increases
b. decreases
c. does not change

Answer 1

C and B people said i got it correct on the question page

Step-by-step explanation:

Answer 2

C for the first one and B for the second I do believe