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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.
Earth, our life supporting planet. Earth, the third closest planet to the Sun, is also the only known planet that supports life. The atmosphere contains 78% nitrogen, 21% oxygen, and 1% argon. The atmospheric layers are  in order of distance from sea level  the troposphere (10 km), stratosphere (45 km), mesosphere (80 km), thermosphere (200 km), and exosphere (400 km).