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Entrenched meanders are evidence for what sequence of geologic events?
Entrenched meanders are evidence for what sequence of geologic events?1) Lateral cutting by streams was followed by subsidence of the land.
2) Land uplift was followed by stream downcutting.
3) A sea level rise was followed by stream downcutting.
4) Stream downcutting was followed by a rise in base level.
Final answer:Entrenched meanders form when land uplift is followed by stream downcutting, retaining the meander patterns while cutting into the bedrock. Option 3 is correct.Explanation:Entrenched meanders are evidence for the sequence of geologic events where land uplift was followed by stream downcutting.During a period of relative tectonic stability, a river has time to develop large meanders due to lateral erosion. If later there is an uplift in the land, which can occur due to tectonic activity, the river incises deeply into the terrain, preserving the shape of the meanders but in a much deeper valley.This is in contrast to the deposition that occurs when sea level rises or base level increases, which would not create entrenched meanders but more likely fill existing valleys with sediment.Entrenched meanders form when the base level for a river remains relatively constant as the land is uplifted around it. This geologic process leads to the river cutting deeply into the bedrock, creating narrow, winding valleys with relatively steep walls that retain the original sinuous course of the river....