Completar Frases continental waterVersión en línea continental water por claudia cuesta alonso 1 flow course River Tributary mouth upper course course lower river meanders middle are continously flowing currents os water that . are rivers that flows into another river . There are three stages in the course of a river : - The : the river flows slowly . I reaches the . - The : the river flows rapidly . It erodes rocks and creates river valleys . - The : the river flows less raidly and transports sand and stones . It creates bends called .