causes+of+tides

A tide is a the periodic rise and fall of the water level in the oceans. In the late 1600s isaac newton identified forces that cause tides.Newton said that the gravitanional pull of the moon on earth and earth's waters is the major cause of tides.The sun is another reason why tides accur,they are smaller altough because the sun is too far from earth than the moon is.When the moon revolves around earth the moon gives out a gravitaniol pull on the entire earth and since the the force of the moon's gravity decreases with the distance from the moon.The side of the earth that is closest to the moon gets more gravitional force.This causes a high tide around the area of the bulge.Low tides form halfway between two high tides and they form because the ocean water flows toward the areas of high tide, the water level in other areas of the ocean drop.