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They are the remains of former flood
plains that lie far above the extent of
present day flooding as a result of
vertical erosion caused by rejuvenation.
It may also be caused by uplift of the
land, a fall in sea level, or a change in
climate. Rejuvenation causes the river to
gain gravitational potential energy. The
terraces themselves are often made from
fluvial material previously dumped by the
river to create the earlier floodplain.
Terraces at Yellowstone River…read more