Our current best estimate is that the western Grand Canyon in Arizona began to be excavated by river erosion about 6 million years ago. The greatest depth of the Grand Canyon is about 1.6 km.
a. What is the mean (average) rate that the Grand Canyon has been eroded into the Colorado Plateau during the past 6 million years, expressed in millimeters per year?
b. If erosion of the Grand Canyon proceeded at that rate during the recent century, how much deeper is it today than it was on the day you were born?
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