1) Atmospheric boundary
Found on
https://www.crosswordclues.com/clue/thermopause
The thermopause is the atmospheric boundary of Earth`s energy system, located at the top of the thermosphere. Below this, the atmosphere is defined to be active on the insolation received, due to the increased presence of heavier gases such as monatomic oxygen. The solar constant is thus expressed at the thermopause. Beyond (above) this, the exos....
Found on
http://en.wikipedia.org/wiki/Thermopause
No exact match found.
