GLACIAL EROSION THEORY. “The ice would have had to shave only an average of 0.002 inches (0.0625 millimeters) of dirt and rock off the crust each year to accomplish this feat, Keller said. That’s a breeze even for modern-day glaciers, he said. Today, erosion rates for continental ice sheets range from 0.004 to 0.19 inches (0.1 to 4.8 mm), with steep mountain glaciers moving nearly 4 inches (100 mm) of rock and dirt annually.”
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