This illustration depicts the Earth's atmosphere and concentric layers that comprise it. The outer-most layer is the Thermosphere, spanning 80 to 500 km from the Earth's surface. Moving inward, the next layer is the Mesosphere, spanning 50- to 80 km from the Earth's surface. Then the Stratosphere, spanning approximately 10 to 50 km from the Earth's surface. Finally, the innermost layer is the Troposphere reaching some 10 km from the Earth's surface. When discussing surface inversions, we generally focus on subsection of the Troposphere: the Surface Boundary Layer, which is in constant flux, but generally spans the first 100 metres form the Earth's surface.

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