Fill in the Blanks COMPLETE THIS TEST.Online version Completa con las etapas de un río. by Clauri Violinista 1 course lake Middle mouth Upper Source course meanders course Lower : the starting point of the river . : the initial stage of the river in the mountains . : where the river flows more slowly through landscape . : in this final stage the river flows slowly and deposits the rocks that it has dragged along whith it and forms curves called . The : at the final stage the water carried by the rivers flows into another river , or sea .