What happens to air pressure in the amount of oxygen as the altitude increases in earths atmosphere?

A Air pressure increases while the amount of oxygen decreases
B Air pressure and the amount of oxygen increases
C Both air pressure and the amount of oxygen decreases
D Air pressure decreases the amount of oxygen increases

1 answer

C Both air pressure and the amount of oxygen decreases

As altitude increases in Earth's atmosphere, the air pressure decreases because there is less air above pushing down. As a result, the amount of oxygen available also decreases because the concentration of gases in the atmosphere decreases at higher altitudes.