The correct option is 2 and 3 only.
Explanation
Glacial depositional landforms are primarily formed by two processes: direct deposition by glacial ice (producing till) and deposition by meltwater streams flowing from the glacier (producing outwash). The physical characteristics of the sediments differ significantly based on the depositing agent.
Statement-wise Analysis:
- Statement 1 is Incorrect. Glacial till consists of unsorted and unstratified debris. Since glacial ice is a solid medium, it transports materials of all sizes-from fine clay to massive boulders-without separating them. When the ice melts, this load is dumped indiscriminately, resulting in a chaotic mixture known as boulder clay or till.
- Statement 2 is Correct. Outwash deposits are formed by meltwater streams. Water acts as a sorting agent; as the velocity of the water decreases, it deposits sediments in layers based on size and weight. Therefore, outwash deposits are stratified (layered) and sorted (assorted), distinguishing them clearly from the unorganized nature of till.
- Statement 3 is Correct. The rock fragments found in glacial till are usually angular or sub-angular because they have been crushed and transported by ice without the tumbling action that rounds stones. In contrast, rock fragments in outwash deposits are transported by running water, which causes attrition and abrasion, resulting in rounded edges and smoother surfaces.
Key Takeaway:
The fundamental difference between glacial deposits lies in the agent of deposition: Ice produces unsorted, unstratified, and angular till, whereas Meltwater produces sorted, stratified, and rounded outwash.