They put huge amounts of carbon dioxide in the air. they also drop aviation gas on waterways especialy near airports, They make noise, and in high air trafic countrys like the usa the vapour and smog they leave in the uper atmosphere actuly causes a cooling of the air below it.
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planes can sometimes be good but sometimes bad
Paper airplanes are effected by aerodynamics just as anything else in the air is. Drag is encountered, and air resistance is related to this.
it can fly
two planes intersect in one line, or the planes could be parallel. by the way there is no such thing as skew planes...
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.