Because of the tides which are controlled by the moons orbit and gravitational force
The sand and other material are deposited on the beach by the wind and tidal currents.
beach
Transgression
Much of the coarser sediment material supplied by rivers settles out near shorelines or on beaches.
ion know
Some of it is carried up the shore and deposited higher up the beach. Some is deposited on the seabed.
Some of it is carried up the shore and deposited higher up the beach. Some is deposited on the seabed.
It is first deposited by rivers. Then it is carried by waves form the ocean floor to the beach.
It forms a beach.
bearem
igneous rock and it became sand
Glacial drift