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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 troposphere (14k jpeg) is the atmospheric layer closest to the planet and contains the largest percentage of the mass of the total atmosphere.It is characterized by the density of its air and an average vertical temperature change of 6 degrees Celsius (C) per kilometer.he troposphere (14k jpeg) is the atmospheric layer closest to the planet and contains the largest percentage of the mass of the total atmosphere.It is characterized by the density of its air and an average vertical temperature change of 6 degrees Celsius (C) per kilometer.