what are the three main zones of a river system from highest to lowest? view available hint(s)for part a what are the three main zones of a river system from highest to lowest? zone of sediment production, zone of transportation, and zone of deposition zone of deposition, zone of sediment production, and zone of transportation zone of sediment production, zone of deposition, and zone of transportation zone of deposition, zone of transportation, and zone of sediment production zone of transportation, zone of sediment production, and zone of deposition