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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.
Much thicker than the troposphere and the stratosphere but only 1% of the atmosphere's gas molecules are found here. The mesosphere extends from the stratosphere to about 85 km above Earth. The thermosphere is directly above the mesosphere and extends more than 500 km above Earth.