Tides are created by the Earth and the moon are attracted to each other , just like magnets are attracted to each other . The moon tries to pull at anything on the Earth to zoom . However, the Earth is able to hold onto everything except the water . Since water is always moving , the Earth can not hold onto it, and the moon is able to pull it. Every 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 are about 12 hours and 25 minutes between the two high tides .