Sediment is a term for little particles of rock that can come in a variety of sizes. Weathering and erosion of massive rocks, as well as other natural and unnatural processes, produce sediment.
Sediment refers to all fragments of rock that break off from other rocks, regardless of size. The basic causes of rocks breaking off into smaller pieces and being carried about include wind, water, and gravity. Sediment can travel short or large distances, depending on what caused the original movement, and this movement can erode the rock even more. When the silt can no longer be transported, it clumps together with other sediment to form rock or sand heaps.