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Many folks don't know what it means. It means lack of debris left after a glacier flattens your landscape. https://1.bp.blogspot.com/-HFM4bl2CQ.../timbestfx.jpg https://4.bp.blogspot.com/-62Xhcv5gW...40/cyrockc.jpg https://2.bp.blogspot.com/-y7hd-pV7H...640/cyrock.jpg https://2.bp.blogspot.com/-yXWczMJuU...lorockface.jpg https://2.bp.blogspot.com/-xqWMo4C84...640/waldog.jpg https://4.bp.blogspot.com/-HSuegbG28...muddyallfx.jpg