Question

which layer of the atmosphere do airplanes reach?
a. mesosphere
b. stratosphere
c. troposphere
d. thermosphere

Explanation:

Airplanes typically fly in the stratosphere. This is because the stratosphere has steady air - less turbulence compared to the troposphere, and it is more suitable for long - distance flight. The mesosphere and thermosphere are too high for commercial airplanes to reach.

Answer:

B. Stratosphere