Which of the following best describes the general term 'till'?

The term 'till' refers specifically to the unconsolidated sediments that are deposited directly by glacial ice. This material is typically a mix of various particle sizes, including clay, silt, sand, gravel, and boulders, which are all shaped and transported by glaciers as they advance and retreat. The process involves the glacier's movement, which incorporates the underlying earth material and any debris along its journey.

Unlike sediments formed by water or wind, till is characterized by a lack of sorting; the particles are left in a random arrangement as the glacier melts and retreats. This combination of raw materials contributes to the fertility and texture of the soil formed from till deposits. In contrast, the other options describe distinct geological processes or materials that do not align with the specific definition of till. For instance, rock fragments from erosion, fine particles carried by wind, and soil enriched with organic matter pertain to other types of sedimentation or soil formation processes, but they do not encompass the unique characteristics that define till.