posted on Feb, 23 2012 @ 07:23 PM
reply to post by Infi8nity
While it may be hot at ground level, most visible cloud consists of ice crystals.
As many a hang-glider pilot has discovered, the higher you go, the colder it gets (in general).
Contrails form when water steam produced by burning hydrocarbon fuels, drops in temperature and becomes firstly water vapor, and then water ice
... and FYI, the word is spelled "extreme".
edit on 23/2/2012 by chr0naut because: (no reason given)