Some beaches are built to great widths by sediments washed to the sea by episodic floods, gradually eroding until the next major flood replenishes the sand ("Beach Formation and Types of Beaches and Sand").
Beach sediments are delivered per year in million cubic yards through longshore transport. Different beaches have different colors and textures because of the various sediments that make them up. There are beaches made up of eroded shale cliffs, multicolored agates ground and polished by the surf, feldspar minerals, ground quartz, and even iron minerals. The various make up of the sediments determine the origin of these sand beaches which help researchers know more information about a particular coast.
Mechanical sediments, also known as clastic sediments, came from the erosion of oceanic rocks formed during the earlier times. These sediments are carried by streams or waves to the place where they are deposited. Ocean sediments, especially in the form of turbidites, are usually carried over and deposited at the bottom of continental slopes ("The Columbia Encyclopedia" 42907).
Chemical reactions in seawater form chemical sediments which results in the precipitation of small mineral crystals that settle to the floor of the sea and finally form a chemically pure layer of sediment somehow.
Organic sediments are formed from plant or animal actions. ...