For 10 points, name this phenomenon that involves the rise and fall of sea levels and comes in high and low varieties.
Hendershott developed the self-attraction and loading term used in models describing this phenomenon. M2 and K1 are the two largest constituents of this. The Rossby number gives an idea of how quickly flows associated with this phenomenon decay. Laplace names an equation that governs this. Their strength is measured in reference to a (*) datum. This phenomena defines the littoral zone. Depending on whether it happens once or twice a day, it is classified into semidiurnal and diurnal forms. The gravitational interaction from the Sun and the Moon cause the forcing for this phenomenon. For 10 points, name this phenomenon that involves the rise and fall of sea levels and comes in high and low varieties.
Hendershott developed the self-attraction and loading term used in models describing this phenomenon.
tides [accept grudgingly oceanic current or oceanic circulation; prompt on current; prompt on flows; prompt on water waves; prompt on partial answers; accept word forms and reasonable equivalents]