There are typically two high and two low tides along the shore each day. These fluctuating tides are caused by the gravitational attraction between the earth, sun, and moon. All surfaces on the earth are pulled toward the sun and moon, but only water can move. Therefore, as the moon revolves around the earth each day, the ocean water is continuously “pushed” towards land causing a bulge, or high tide. Roughly six hours later, the water has been “pulled” away from the land so much that it causes what’s known as low tide. This push and pull action causes the sand to be moved from one place to the next with each tide cycle.