Assume that the dunes in a field of barchan sand dunes are moving at an average long-term rate of 30 meters (about 100 feet) a year: a. How long does it take a dune to move a distance of 500 meters? _____ years b. If one of the dunes is 10 meters wide, how many years does it take that dune to completely cross an abandoned 100-meter wide airport runway? _____ years

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