* The Power of Ice: Glaciers are incredibly powerful erosive forces. They grind and crush rock as they move, creating a mixture of boulders, pebbles, sand, silt, and clay.
* No Sorting: Unlike rivers, which sort sediment based on size and weight, glaciers lack the ability to sort the material they carry. This is because the ice carries everything along, regardless of size, and deposits it all together when the glacier melts.
Key characteristics of till:
* Poorly sorted: Contains a wide range of particle sizes, from large boulders to fine clay.
* Angular: Particles often have sharp edges due to the grinding action of the glacier.
* Unsorted: No distinct layering or stratification.
* Matrix-supported: Smaller particles fill in the spaces between larger particles.
Examples of features formed by till:
* Moraines: Ridges of till deposited at the edge of a glacier.
* Drumlins: Elongated hills of till formed by glacial erosion and deposition.
* Eskers: Winding ridges of sand and gravel deposited by meltwater streams flowing beneath a glacier.
While till is the most common glacial sediment, other types can form, like:
* Outwash: Well-sorted sand and gravel deposited by meltwater streams flowing away from a glacier.
* Loess: Fine-grained silt deposited by wind from glacial outwash plains.
So, although glaciers are powerful erosive forces, they don't produce well-sorted sediment. Instead, they create a unique and characteristic sediment called till.
