What would cause a river to have a series of terraces lying at different elevations, all above its modern floodplain?

Question

Quizplus · Accepted Answer

River terraces are typically formed as a result of incision into the landscape, which can be caused by tectonic uplift of the land or by a lowering of the base level (e.g., sea level drop), leading the river to erode its bed and create terraces at different elevations as it adjusts to its new profile.

What Would Cause a River to Have a Series of Terraces