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An ocean tide refers to the cyclic rise and fall of seawater. Tides are caused by slight variations in gravitational attraction between the Earth and the moon and the sun in geometric relationship with locations on the Earth's surface. Tides are periodic primarily because of the cyclical influence of the Earth's rotation. |
| Diurnal Tide Tides that have one high and one low water per tidal period |
Semi-Diurnal Tide Tides that have two high and two low waters per tidal period. |
Mixed Tide Tides that have a higher high water and lower high water as well as higher low water and lower low water per tidal period. |