What are those tiny jets that leaves those long trails of white smoke in the sky?
They're so high up in the sky you can barely make them out, but they leave those realy really long white trails of smoke, or vapor, behind them from one end of the sky to the other...
WHAT are they?
WHO flies them?
WHERE do they come from and where are they going?
Think of it this way if you've ever been in a car on a very cold day and blew your breath on the window you notice that the window becomes foggy this is because hot air and cold air condense and freeze causing a formation of ice and very cold vapor.
as who fly's them? All the airlines and military's of the world
Here is a more scientific approach to this
http://cimss.ssec.wisc.edu/wxwise/class/contrail.html
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