Final Answer:
Glacial till is composed of D: Boulder-sized sized particles.
Step-by-step explanation:
Glacial till is composed of boulder-sized particles. This type of sedimentary material is the result of glacial activity, where the movement and abrasion of glaciers lead to the formation of a mixture of unsorted and unstratified material.
The boulder-sized particles in glacial till can vary widely in composition and originate from the underlying bedrock that the glacier has eroded and transported.
Glacial till is characterized by its heterogeneous nature, containing a mixture of particle sizes, including sand, silt, clay, and particularly large boulders. The boulder-sized particles are indicative of the glacier's capacity to transport and deposit large rock fragments as it moves, shaping the landscape through processes of erosion and deposition. Understanding the composition of glacial till is essential for geologists and environmental scientists studying past glacial activity and its impact on landforms.
option d