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A. Troposphere B. Stratosphere C. Mesosphere D. Thermosphere. A: Troposphere is the atmospheric layer closest to the Earth's surface. Log in to see link for more information. Question|Asked by janiya. Asked 314 days ago|6/9/2016 2:02:09 PM. Updated 314 days ago|6/10/2016 2:53:26 AM.
Jet airliners fly in this layer, for it is far less turbulent than the underlying troposphere. The stratosphere extends upward from the top of the troposphere to an altitude of about 50 km. The ozone layer lies within the stratosphere. Moving upward, the next layer is the mesosphere. By this point the atmosphere is very thin. Temperatures once again decline with increasing altitude (as was the case in the troposphere), falling as low as -100Â° C (-146Â° F) in the upper mesosphere.