Question

give reasons.
Jet planes flying in the sky leave a white trail behind

Answer 1

Hey Mate!!

Here Is Answer To Your Question

Firstly, the trails of smoke you see are not actually smoke and are calledcontrails (CONdensation TRAILS). "They are formed when the water in jet exhaust (and there’s quite a lot of it) mixes with wet cold air, and condenses and freezes into ice crystals. --

Contrails are actually a type of cirrus cloud."
Secondly, all planes CAN produce contrails. It depends on factors like type ofengines (including the APUs) and altitude.

Regards Vishal____(BhamBhamBhole)

Answer 2

BECAUSE THEY RELEASE many harmful gases which is equal to the carbon dioxide released by a human in a year.