A beach is a landform alongside a body of water
which consists of loose particles. The particles composing a beach are typically made
from rock, such as sand, gravel, shingle, pebbles, etc., or biological sources, such
as mollusc shells or coralline algae. Sediments settle in different densities and structures,
depending on the local wave action and weather, creating different textures, colors and
gradients or layers of material.
Learn more at Wiki Beaches