Ice age glaciers carved a deep, straight U-shaped trough out of the granite bedrock, creating steep valley walls and a wide, flat valley floor.
(Ice age glaciers; carved; a deep, straight U-shaped trough) Context(Ice age glaciers carved,List([0, 23))):(Ice age glaciers; carved a deep, straight U-shaped trough creating; steep valley walls and a wide, flat valley floor)
Ice age glaciers carved,List([0, 23))
Ice age glaciers Ice age glaciers
carved carved a deep, straight U-shaped trough creating
a deep, straight U-shaped trough
steep valley walls and a wide, flat valley floor