In a landmark study for space-based observation of the motions of the earth's crust, geologists have used the same satellite navigation system used to guide motorists and boaters to monitor the movement of an entire continent and record the yearly growth of the Andes Mountains in South America to within a fraction of an inch.
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Northwestern University. "Navigation Satellites Track Yearly Growth Of Mountains." ScienceDaily. ScienceDaily, 20 January 1998. <www.sciencedaily.com/releases/1998/01/980120044003.htm>.
Northwestern University. (1998, January 20). Navigation Satellites Track Yearly Growth Of Mountains. ScienceDaily. Retrieved March 11, 2014 from www.sciencedaily.com/releases/1998/01/980120044003.htm
Northwestern University. "Navigation Satellites Track Yearly Growth Of Mountains." ScienceDaily. www.sciencedaily.com/releases/1998/01/980120044003.htm (accessed March 11, 2014).