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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.
The stratosphere is the second layer, as one moves upward from Earth's surface, of the atmosphere. The stratosphere is above the troposphere and below the mesosphere. The top of the stratosphere occurs at 50 km (31 miles) altitude. The boundary between the stratosphere and the mesosphere above is called the stratopause.