Zigzag.
US Map to prove (check the link).
And an image (check the link).
They cross at the two poles.
Never
The planets would no longer follow their orbital paths around the Sun. They would move away from the Sun and travel in straight lines.
The Mercator projection does that.
In a circuit diagram a connecting wire is shown as a straight line. <<>> On an electrical schematic where two lines intersect each other, a black dot represents a connection at that point. If there is no black dot, the intersecting lines just cross each other.
straight, curved, zigzag, and bent.
Straight lines that never cross are called parallel lines.
There can be a combination of the two - a line that is straight for a while and then curved, or a zigzag.
parell lines
Straight, bent, curved, zigzag. (Sin, cos, tan, and summin' I forget.)
parallel
intersecting lines...
Two straight lines can cross either once or never.
parellel lines
In 2 dimensions, a polygon. In 3 dimensions, a polyhedron.
horizontal, oblique, wavy, curve, vertical, zigzag, broken, angular, straight, dotted
The spelling zigzaggy is an adjective, but so is just zig-zag or zigzag. The word zigzag is also the adverb, and more rarely a noun.E.g. The zigzag lines / the lines were drawn zigzag across the page / The road continued in a zigzag to the top of the hill.