Answer
Antecedent streams and superposed streams are related to the geologic history of the landscape. Antecedent streams were established before the current topography developed, and their flow path was preserved as the land uplifted or was eroded. Superposed streams, on the other hand, are streams that develop on one type of rock but then cut through it to flow on a different type of underlying rock. This occurs when a river system develops on a landscape that has been folded or faulted, and the river's course is "superposed" onto the underlying geological structure.
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