Compléter ETAPAS DE LOS RIOSVersion en ligne Completa las definiciones de las etapas de los rios par Alberto Pacetti Sánchez 1 rocks slowy stage initial carried river river river stage flows flows initial final water slowy final river mountain 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 .