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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.
There are five layers of atmosphere that protect the earth from the sun and other space debris. The thickest layers are located near the surface and thins out with height until it merges with the bare space. The five surface from the surface to earth; troposphere, stratosphere, mesosphere, thermosphere , and exosphere respectively. The Stratosphere is where the ozone layer is formed with just about 3 millimeters thick and 20 km above the earth surface.