What describes the sediment at a beach?

Beach sediment is typically characterized by fine to coarse sand, along with the potential presence of gravel and cobbles. This composition results from the dynamic processes of wave action, erosion, and sediment transport, which collectively shape the coastal landscape. Sand particles are predominant due to their ability to be easily moved and deposited by the constant movement of water.

The presence of gravel and cobbles further indicates the influence of stronger wave action, which can transport larger materials. Beaches are formed through a combination of various sediment sizes, allowing for diverse beach environments ranging from soft, fine sands to coarser, rockier shorelines.

In contrast, other sediment types mentioned, such as very fine silts and clays, are typically found in calmer environments like lagoons or estuaries and would not be representative of beach settings. Additionally, the mention of only large boulders and rocks does not account for the more common size spectrum found on beaches, which predominantly consists of sand. Lastly, while organic matter can be found in some coastal areas, it does not accurately describe the primary characteristics of beach sediment, which is mainly mineral-based rather than rich in organic material.