Which statement best describes the composition of glacial till?

Glacial till is best described as an unsorted, heterogeneous mix of rocks and sediments. This composition results from the process of glaciation, where glaciers erode the underlying bedrock and pick up various materials as they advance. When glaciers melt, they deposit a mix of materials including clay, silt, sand, gravel, and larger rocks without any specific order or layering.

This lack of sorting is a defining characteristic of glacial till, contrasting with sediments deposited by water, which tend to be sorted and layered due to the natural sorting processes of moving water. Other materials like uniformly graded sediment or pure clay deposits would indicate a more controlled depositional environment, typically involving water movement rather than the chaotic nature of glacial deposits.