ocean floor, lights and tides
"Sea levels alternate between falling and rising. We've come to know such motions, and we call them tides. They all relate to the gravitational energy of the moon and sun.
Tides don't just work alone by themselves. There is a correlation between the way the earth moves, along with the way the moon and sun respond. As planet Earth spins on an axis, the ocean water will remain equal. This is because the Earth's gravity is tugging towards the center so the centrifugal force pushes more to the outside.
When the moon comes in with its powerful force, it can accelerate ocean water towards it. That's when you see high or low tides. This video is amazing in showing the ocean's gravitational force."