How are beaches formed?

Wave and tidal actions transport sand, pebbles, sea shells and gravel to the shorelines of oceans seas and lakes. The sand, pebbles, and gravels were either transported by erosion from the continental landmass by rivers and streams, or created by the mechanical weathering of wave actions against rock formations near the shore. Wind and storms can deposit the rock and shell particles further inland, creating a gently sloped beach.
Rock is smashed against a cliff and they are ground up into sand and a beach is formed.
Wave and tidal actions, along with land-based winds, transport sand, pebbles, sea shells and gravel to the shorelines of oceans, seas, and lakes. The sand, pebbles, and gravels were either transported by ocean currents or wind from the landmass and the deposits slowly build up to form what we call "the beach" or "shore".