1. Gravity Wave
Gravity waves, not to be confused with gravitational waves, form when air is pushed up and gravity pulls the air back down. On its way down, air displaces ocean water, forming waves that look like vertical channels. There are different types of gravity waves. Gravity waves that form on the surface of the water are called surface gravity waves. Waves that occur inside of a body of water are called internal waves. Waves created by wind on the surface of the water are wind-generated waves.