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(a) Sand dunes on a desert island move as sand is swept up the windward side to

ID: 1304929 • Letter: #

Question

(a) Sand dunes on a desert island move as sand is swept up the windward side to settle in the leeward side. Such "walking" dunes have been known to travel 22 feet in a year and can travel as much as 110 feet per year in particularly windy times. Calculate the average speed in each case in m/s.


(b) Fingernails grow at the rate of drifting continents, about 10 mm/yr. Approximately how long did it take for North America to separate from Europe, a distance of about 3000 mi?
______y

22 ft/y =______ m/s 110 ft/y =____ m/s

Explanation / Answer

a) 22 ft/y = 2.12

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