Well when a particle of air is becomes heated it rises, right? So you could write some like you started off close to the earth (aka the troposphere) until you became heated then you started to rise and as you reached higher elevations you cooled down and you were recycled into cool air and you moved back down and became new fresh cool air until the next time you'll become heated and rise again to be recycled into fresh cool new air.
A new material is formed in <span>result of a chemical change. Typically, the chemical changes always make the new material.</span><span />
At higher temperature, and lower pressure.
Well, I say the answer is Thermosphere! Hope I helped :)
