Relate the formation of incised meanders to changes in base level
What will be an ideal response?
Meanders form on flat valleys near base level. Incised meanders, meanders cut deeply into bedrock, indicate that a change must have occurred such that the river stopped its lateral movement and began eroding the streambed. The only change that would trigger this is a base-level drop. This could have been either by dropping sea level (perhaps by freezing water into glaciers) or by uplifting the land (mountain building).
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