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27 February, 00:35

1. Assume that the dunes in a field of barchans sand dunes are moving at an average long-term rate of 30 meters (about 100 feet) a year. How many years does it take a dune to move a distance of 500 meters?

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  1. 27 February, 01:55
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    16.67 years

    Explanation:

    It moves a distance of 30 m in a year.

    The time required tp move 500 m = 500 / 30 = 16.67 years
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