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An excellent question. And as a follow-on, you might ask why they only occur in a fairly narrow band of elevation--roughly 32,000 to 34,000 feet--and seldom above or below that.
I am looking for good questions and am hoping that the combined wisdom of my
esteemed colleagues will be able to help me out. Questions I can ask my
high school physics class that will cause them to apply things they have
learned over the years in an effort to figure out the way things are or how
they work. One such questions that I have used many times with great
success follows. Perhaps it will give you more of an idea of what I am
looking for.
1) What causes the contrail behind a jet airplane and what is it made out
of?