1. The process by which a glacier picks up rocks as it flows over the land2. Water @ bottom melts => enters cracks in rocks => freezes => as the glacier moves, these rocks are 'plucked' and carried => these rocks now act as sandpaper => scrape the floor as the glacier moves

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1. 1. The process by which a glacier picks up rocks as it flows over the land
2. Water @ bottom melts => enters cracks in rocks => freezes => as the glacier moves, these rocks are 'plucked' and carried => these rocks now act as sandpaper => scrape the floor as the glacier moves