Compléter Relief and rivers.Version en ligne Complete the sentences . par Esther Lara Barroso 1 final slowly initial dragged it starting flows less slowly rapidly deposit curves rocks plain Source : the point of the river . Upper course : the stage of the river in the mountains . The wáter flows and drags with it . Middle course : where the river flows more through landscapes that are steep , forming a flood . Lower course : in this stage the river and the rocks that it has with and forms called meanders .