When a movement occurs in two planes, it is called turbulence.
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Angles are formed between them
two planes intersect in one line, or the planes could be parallel. by the way there is no such thing as skew planes...
parallel planes
There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.