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This graphic shows how the combination of hill-slope erosion and precipitation-generated runoff have shaped a landscape of orderly ridges and valleys over geological time. Through experimentation involving controlling and dictating various natural processes and observing landscapes that arise, University of Oregon geologists now have a better idea of how climate change can impact landscapes. The regularity of hill and valley landforms is created as a result of a tug-of-war between erosion driven by runoff and soil movement on hillsides. Simply put, runoff processes carve valleys while soil movement on hillsides fills them.
Contributed by Sam Feldstone