This crust forms an extra protecting layer that resists wind erosion except disturbed by animals or dissolved by the advancing tide. Cusps and horns form where incoming waves divide, depositing sand as horns and scouring out sand to form cusps. White sand beaches look white as a result of the quartz or eroded limestone within the sand displays or scatters sunlight without absorbing other colours. In a zero-depth entry pool, the bottom surface slopes progressively from above water down to depth. Another approach includes so-called urban seashores, a form of public park turning into widespread in massive cities.
Seawalls could protect one part of beach while leaving one other with little sand. Seawalls can even enhance the velocity at which beaches retreat. When tides and waves hit massive seawalls instead of seashores, they bounce again to the ocean with more power.
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