skew
They may be either parallel or skew.
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.
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.
If the lines are in the same plane and never intersect they are always parallel. Two line can not intersect and be parallel if they are in different planes though. Take a cube for example, if you have one Sid of it and take the edge and then go to the opposite side and make a horizontal line they will never intersect but are also not parallel.
skew
parallel planes
parallel
skew lines
No. By definition, planes can be extended in all directions to infinity. If they are not parallel, they will intersect somewhere.
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.
No
Parallel
Each line can either intersect the edge which is common to the two planes at some point or be parallel to it. If the two lines intersect the edge, but at different points, then the lines are skew. If only one of the lines intersects the edge, then again the lines are skew. If neither of them intersect, then the two lines are parallel to the same edge and so they are parallel to one another so not skew.
Those are parallel planes.
No, they are either parallel, or they intersect
They may be either parallel or skew.