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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 orange layer is the troposphere, the white layer is the stratosphere and the blue layer is the mesosphere. (The shuttle is actually orbiting at an altitude of more than 320 km (200 mi), far above all three layers.). Earth atmosphere diagram showing the exosphere and other layers.rom Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius. The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 75% of the atmosphere 's mass and 99% of its water vapor and aerosols.