Yep. This is due to variations in the gravitational magnitude at any point from the earth, moon, sun, and other bodies, as well as the periodicity of the earth/moon/sun rotations interacting with friction (between the sea and the sea, the sea and the atmosphere, and the sea and the lithosphere), and creating a giant standing wave (which is constantly changing, like an instrument or a musical composition) of ocean water all over the earth. This doesn’t even take into account atmospheric pressure and water temperature/viscosity variations. The earth is a complex system with waves upon waves upon waves of interacting coupled oscillations all interfering with each other. Whoa 😳