The glaciers pushed rock debris down the mountainside and left the bulldozed piles and walls, called moraines, when they melted.
(The glaciers; pushed; rock debris; down the mountainside) (The glaciers; left; the bulldozed piles and walls, called moraines, when they melted) (they; melted; )
The glaciers The glaciers they
pushed left melted
rock debris down the mountainside
the bulldozed piles and walls, called moraines, when they melted