Compléter ETAPAS DE LOS RIOSVersion en ligne Completa las definiciones de las etapas de los rios par Alberto Pacetti Sánchez 1 river flows water river flows mountain final slowy river final river carried slowy stage initial initial rocks stage The source is the of the river . Upper course is the stage of the in the . Middle course is the where the more . Lower course is the stage and flows , it also deposit . The mouth is i the stage and the by the river into another .