What characterizes vertical movement?

Vertical movement is characterized by its direction along an axis that goes up and down, as opposed to horizontal movement, which occurs side to side. This distinction is fundamental in understanding motion in physics and various scientific contexts. While options that suggest vertical movement is limited to either only upwards or only downwards may describe specific instances of vertical movement, they do not encompass the full range of vertical movement possibilities. Vertical movement can occur in both upward and downward directions, making the first option the most accurate definition. It emphasizes that any movement that is not horizontal inherently falls under the scope of vertical movement, regardless of the specific direction taken.