a number of natural forces form _______
a gorge.
the most common is ______ due to streams or rivers
erosion
streams carve down through _______________ , breaking down and eroding it.
hard layers of rock
________ from the worn-away rock is then carried down-stream
Sediment
Overtime, this process will form ________ of a gorge.
the steep walls
what course are gorges found
Upper course