Explanation:

The periodical rise and fall of the sea level, once or twice a day, mainly due to the attraction of the sun and the moon, is called a tide. The most common tidal pattern featuring two high tides and two low tides each day. The successive high or low tides are approximately of the same height. Although tides occur twice a day, their interval is not exactly 12 hours. Instead, they occur at regular intervals of 12 hours and 25 minutes.