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Hmm! Seems like this would be easy to answer. You must not have a clear image of a glacier. Chicago was once covered by part of one. It was taller than the Sears Tower. It stretched the lenghth of present day America. Get the picture now? Yes, massive stuctures of ice! As glaciers expanded (travelled) they moved everything that wasnt "nailed down" either in front of them or gobbled it up. So where once there might have been a raised piece of soft ground......no longer; gone, down to bare rock. Then when they retreated (melted) they dumped whatever they had collected. So on the outward jouney they scoured the earth (e.g. made lakes) and when they melted they dumped massive amounts of debris, that today are most noticeable when someone digs out one for commercial use of sand or gravel that they contain. Neatly left in piles, courtesy of the glacier.

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