11. What happens to atmospheric pressure as a person rises in altitude?
A. It's unaffected by changes in altitude.
OB. It decreases.
C. It changes based on the time of year.
D. It increases.

see explanation

Explanation:

Increase altitude => decreasing pressure... as matter of fact, the standard lapse rate is - 1.0 lbs/in² per 1000 feet. That is ...

at earth's surface => P = 14.2 psi

at 1000ft => P = 13.2 psi

at 2000ft => P = 12.2 psi

at 5000 ft => P = 9.2 psi and so on.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.