Erosion of rock, coral and shells and mechanical abrasion from animals feeding on those things.
Some of the sand will sink to the bottom of the water. There is no chemical reaction. However, some of the sand may go into suspension, making the water muddy. This is a physical change that can be reversed by filtering the muddy water.
Wave erosion is the primary type of erosion that causes beaches. Waves carry sand and other sediments away from the shore, shaping the coastline over time. Erosion by waves can create beaches through the deposition of sediment along the shore.
Sand bars are caused by the deposition of sand along a shoreline where waves and currents slow down and drop sediments. They can form at the mouths of rivers, along coastlines, or offshore in the ocean. Sand bars can change in shape and size due to wave action, tides, and storms.
Hydrophobic sand is a special type of sand that is coated with a water-repelling chemical. This coating prevents the sand from absorbing water, which causes the sand grains to stay dry even when submerged in water. This unique property makes hydrophobic sand popular for creating various water-related science experiments or for building structures underwater.
The wind deposits sand when it loses its ability to carry it due to a decrease in wind speed or when it encounters an obstacle that blocks its path. This causes the sand particles to settle out and be deposited in a new location.
The wind causes movement
Scientificly, sand dunes were formed by chemical weathering.
glaciers
wind
Usually from people taking showers whilst covered in sand.
Loose sand sand and dirt are picked up by heavy winds.
Wind moving sand causes dunes, both in the desert and at the beach.
filaria
Undertow causes the sand to be removed from the beach and carried back out into the water.
Wind moving sand causes dunes, both in the desert and at the beach.
wind
Wnd