Earth's atmosphere is primarily composed of _____.
Aargon
Boxygen
Cnitrogen
Dcarbon dioxide user: air pressure _____ with elevation.
Aincreases
Bdecreases
Cdoes not change
Aargon
Boxygen
Cnitrogen
Dcarbon dioxide user: air pressure _____ with elevation.
Aincreases
Bdecreases
Cdoes not change