Ocean water movement is classified into horizontal and vertical types, which are respectively:

1. Ocean water moves in two broad directions, across the surface and up or down through it. 2. Horizontal movement is the flow of water from one region to another, which is an ocean current. 3. Vertical movement raises and lowers the water column, which shows as tides and waves. 4. Naming these two classes correctly is what a good introduction to the topic rests on. 5. Salinity gradients drive some vertical movement, but they are a cause rather than a class of movement. _Source: NECTA ACSEE 2023 Geography 113/1, Question 4: Water Masses_