Question

Airplanes reach cruising altitudes at the lower part of the Earth's stratosphere. This portion of the atmosphere is made up mostly of and ?

Answer 1

The stratosphere is a layer of Earth's atmosphere. ... The troposphere, the lowest layer, is right below the stratosphere. ... Because of this, jet aircraft and weather balloons reach their maximum operational altitudes within the stratosphere. ... from the bottom of the stratosphere up to altitudes of 40 or 50 km (25 to 31 miles).

Step-by-step explanation:

Answer 2

nitrogen and oxygen are found in the Earth's stratosphere, which is the second-lowest layer of the atmosphere. These are the two most common gases throughout the whole atmosphere.

Step-by-step explanation: