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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.
Troposphere. The troposphere is the layer closest to the earthâs surface and the part of the atmosphere that we know about best. It extends from sea level to almost 19 km above the equator, but only 9 km above the North and South Poles.In the troposphere it gets colder the higher up you move.Temperatures drop by about 0.7Â°C to 1 Â° C every 100 meters. This lower part of the atmosphere is responsible for our weather.t extends from sea level to almost 19 km above the equator, but only 9 km above the North and South Poles. In the troposphere it gets colder the higher up you move. Temperatures drop by about 0.7Â°C to 1 Â° C every 100 meters. This lower part of the atmosphere is responsible for our weather.