Rivers carve down rock at different speeds through time, which means researchers may have to rethink how they measure erosion, according to a study in Nature. "River incision is the yardstick we use to measure a lot of processes. There were a lot of reasons to think these things were in equilibrium, but you can't simply take a rate and tell a story with that rate," said lead author Noah Finnegan, a University of California at Santa Cruz geomorphologist.

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