What is a tidal cycle that includes one high tide and one low tide each day called?

A tidal cycle that features one high tide and one low tide each day is referred to as a diurnal tide. This phenomenon occurs due to the gravitational pull of the moon affecting the tides. In a diurnal tide system, the water level rises to a high point and then falls to a low point over the course of a 24-hour period. This is characteristic of certain coastal regions where the tidal influence is primarily defined by a single peak and trough of water level each day.

In contrast, a semidiurnal tide, which is not the correct answer, consists of two high tides and two low tides within a single lunar day. Spring and neap tides refer to variations in tidal range that occur due to the relative positions of the Earth, moon, and sun, and do not define the daily cycle of tides. Therefore, the distinction of one high tide and one low tide in each 24-hour period clearly identifies the cyclic pattern characteristic of diurnal tides.