they go up & down
Vertical lines go up and down. Horizontal lines go left to right.
vertical
Vertical lines are lines that are drawn / made perpendicular to the horizon. In other words, they go "ceiling to floor", not "wall to wall" or "corner to corner."
Because they only go in one (1) direction.
Vertical goes up and down.
Yes. Longitude lines on a map are vertical and latitude lines are horizontal. But it could be the other way around too. It depends on how you hold your map.
Non-vertical lines could be slanted or horizontal.
No. Horizontal lines have zero slope. Vertical lines have infinite slope.
They are simply just called lines.
No. The non-vertical angles need not be related to one another in any way.
Vertical lines are lines that go straight up and down, with no horizontal component. Some real examples of vertical lines include the edges of a door frame, the corner of a bookshelf, and the sides of a skyscraper. These lines have a slope that is undefined, as they have no horizontal change.
Vertical lines parallel to the prime meridian are lines of longitude.