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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 boundary between the mesosphere and the thermosphere above it is called the mesopause. At the bottom of the mesosphere is the stratopause, the boundary between the mesosphere and the stratosphere below. The mesosphere is difficult to study, so less is known about this layer of the atmosphere than other layers.redit: Randy Russell, UCAR. The mesosphere is a layer of Earth's atmosphere. The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet.