Flexi Says: Tides are daily changes in the level of ocean water. They occur all around the globe. High tides occur when the water reaches its highest level in a day. Low tides occur when the water reaches its lowest level in a day. Tides keep cycling from high to low and back again. In most places, the water level rises and falls twice a day. So there are two high tides and two low tides approximately every 24 hours. When the two high and two low tides are about the same height, then the pattern is called a semidiurnal tide.
