Final answer:
Waves in the middle of the ocean mainly have a horizontal movement with the particles of the medium moving up and down.
Step-by-step explanation:
The movement of waves in the middle of the ocean is mainly horizontal.
In the ocean, waves are transverse waves which means that the particles of the medium, in this case water, move up and down while the energy of the wave travels horizontally.
For example, when a wave passes under a sea gull, the bird moves up and down in simple harmonic motion while the wave travels horizontally through the water.