No
parallel planes
parallel
No. By definition, planes can be extended in all directions to infinity. If they are not parallel, they will intersect somewhere.
Parallel
No. Consider two adjacent faces on a cuboid. Both planes are parallel to the edge at which the intersect. But the fact that they do intersect illustrates that they are not parallel.
Those are parallel planes.
No, they are either parallel, or they intersect
In geometry, two planes intersect in a line. The only time this is not true is if the two planes are parallel to each other.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
Some planes are parallel and don't intersect at all. Those that do intersect (and that are not coincident, i.e. the same plane) intersect in a line.
Yes.
Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.