As the glaciers moved down from the mountain tops, they scoured the bedrock into broad U-shaped valleys, ground the bedrock into boulders, gravel, cobbles, and silt and deposited it along the valley floor and wall.
(the glaciers; moved; down from the mountain tops) (they; scoured; the bedrock; into broad U-shaped valleys; T:As the glaciers moved down from the mountain tops) (they; ground; the bedrock; into boulders, gravel, cobbles, and silt) (they; deposited; it; along the valley floor and wall)
the glaciers they they they
moved scoured ground deposited
down from the mountain tops
the bedrock into broad U-shaped valleys T:As the glaciers moved down from the mountain tops
the bedrock into boulders, gravel, cobbles, and silt
it along the valley floor and wall