When the glaciers melt, exposing the valleys' floors, the valley formed by the tributary glacier meets the valley formed by the main glacier at an elevation that is higher than the floor of the main valley.
(the glaciers; melt; ) (an elevation; is; higher than the floor of the main valley) (the glaciers; exposing; the valleys' floors) (the valley; formed; by the tributary glacier) (the valley formed by the tributary glacier; meets; the valley formed by the main glacier at an elevation; T:When the glaciers melt, exposing the valleys' floors) (the valley; formed; by the main glacier at an elevation)
the glaciers an elevation the glaciers the valley the valley formed by the tributary glacier the valley
melt is exposing formed meets formed
higher than the floor of the main valley
the valleys' floors
by the tributary glacier
the valley formed by the main glacier at an elevation T:When the glaciers melt, exposing the valleys' floors
by the main glacier at an elevation