Terraces are abandoned floodplains formed when a stream flowed above its present channel and flood-plain level. These form when a stream erodes downward through its deposits, to a new lower level. Paired terraces are terrace remnants that lie at the same elevation on either side of the present flood-plain. Nonpaired terraces form at different levels on either side of the current floodplain, and imply several episodes of erosion. Rivers and streams may downcut through older terraces for a variety of reasons, including climatically influenced changes in discharge, or uplift of the river valley and slopes, causing a change in the river profile.
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