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how do glaciers erode
plucking and abrasion
plucking
glacier flow loosens and lifts rocks from the glacier bed; meltwater penetrates the cracks and joints of bedrock beneath a glacier and freezes
abrasion
acts like sandpaper smoothing and polishing the underlying rock surfaces; rock pieces frozen to the base of a glacier scour the landscape; produces striations, polish, and rock flour
glacial striations
grooves in the bedrock
glacial polish
smoothed shiny bedrock
rock flour
pulverized rock
glacial flow
result of internal deformation and basal sliding
internal deformation
movement within the ice; when ice is over 50km thick it behaves plastically and flows
basal sliding
ice slides over the underlying surface; often enabled by meltwater at the base acting as a lubricant enhancing sliding motion