The Moon, The Sun and The Tides

The word "tides" is a generic term used to define the alternating rise and fall in sea level with respect to the land, produced by the gravitational attraction of the moon and the sun. Tides are created because the Earth, the Moon and the Sun are attracted to each other, just like magnets are attracted to each other.

The Moon and the Sun tries to pull at anything on the Earth to bring it closer. But, the Earth is able to hold onto everything except the water. Since the water is always moving, the Earth cannot hold onto it, and the Moon and the Sun are able to pull at it.  Each day, there are two high tides and two low tides. The ocean is constantly moving from high tide to low tide, and then back to high tide. There is about 12 hours and 25 minutes between the two high tides.

How the Ocean is Affected by the Moon and Sun

Simulator courtesy of University of Nebraska-Lincoln
Student Project How the Moon affects the tides