What is accumulated material, including sand, shingle, and pebbles, located between low and high water marks called?

The term for accumulated material, including sand, shingle, and pebbles, located between low and high water marks is known as a beach. Beaches are formed through the process of sediment deposition, where wave action transports and deposits various materials along the shoreline. This accumulation can be influenced by factors such as wave energy, tidal actions, and coastal currents.

A coastal sand dune refers to a specific type of landform that is formed from loose sand, which is often located behind the beach area. While it may be related to the sandy material found on a beach, it does not describe the area between the tidal marks specifically.

The word "tide" refers to the regular rise and fall of sea levels caused by the gravitational effects of the moon and the sun, but it does not pertain to the physical accumulation of materials between the water lines.

An offshore headland is a distinct landform that extends into the ocean, typically composed of harder rock resistant to erosion. While it is related to coastal geography, it does not describe the sandy area where various beach materials accumulate.

Overall, a beach is the correct term for the area characterized by accumulated materials like sand, shingle, and pebbles along the shoreline, making it the best choice