Fingernails grow at the rate of drifting continents about


1 ) 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 20 feet in a year and can travel as much as 100 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 3 000 mi?

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