ASVAB General Science Practice Test 389647

Question 2 of 5
Troposphere

The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.

Earth's breathable air is held in which atmospheric layer?

stratosphere

thermosphere

troposphere

mesosphere