Glacial processes

Plucking: loose bedrock freezes and is pulled away as the glacier moves, creating a jagged surface.
Abrasion: rocks at the bottom of the glacier scrape and smooth bedrock.
Freeze-thaw weathering: water enters cracks in a rock, freezes, and expands, breaking the rock apart.
Bulldozing: occurs when the glacier’s snout (front) pushes loose material (e.g. rocks, soil) downhill.
Rotational slip: occurs when meltwater at the base of a glacier reduces friction, allowing the glacier to slide downhill.
Glacial till: unsorted material deposited by a glacier.
Outwash: sediment (sand, gravel, silt) deposited by meltwater from a glacier, usually sorted and found in outwash plains.

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