Submitted by admin on Sat, 05/17/2014 - 19:55
definition:
A mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.
sentence:
It is also likely that mass movement is much more common during periods when glaciers are retreating; large moraines and steep valley sides are then unstable because they are no longer supported by the glacier.
difficulty:
hard
toefl frequency:
1
toefl classification: