the current pick up tiny peses of rock that are lose in the sand
Because they are transported by water currents.
Large rocks can be transported by natural processes such as glaciers, rivers, and ocean currents. These processes are capable of moving rocks of various sizes over long distances by erosion, deposition, and ice movement.
By weathering. The water currents weather the rocks leaving them smooth.
Water
energy
Current ripple marks
Transported by the water currents.Can swim with rhythmical contractions of the bell(muscles).
By the currents themselves - water contains oxygen (hence H2O), and nutrients, thanks to decaying (biotic) matter which, yes, contains nutrients even when no longer living.
Large volumes of bottom sediments can be transported long distances by processes such as turbidity currents, underwater avalanches, and longshore drift. These processes involve the movement of sediment-laden water in rivers, currents, or waves that can carry sediments over vast distances across the ocean floor.
Big rocks end up on the beach primarily through geological processes such as erosion and weathering. Over time, waves, wind, and currents wear down larger rocks from cliffs and coastal areas, breaking them into smaller fragments. These fragments can be transported by water and eventually deposited on the beach. Additionally, tectonic activity can also expose large rocks, which may subsequently be eroded and moved by natural forces.
They are really small and they make sedimentary rocks if they clump together in layers over time. They come from other rocks. They can be transported by wind, water, and ice.
Sediment can be transported by various processes including water (rivers, ocean currents), wind, glaciers, and gravity (landslides). Once sediment is eroded or broken down from rocks, it can be carried by these forces and deposited in a different location.