"When one observes the many and great changes that have occurred in some s since the beginning of the , he is inclined to the belief that a longer period of time was involved than he had been led to believe. is an example where lakes of great depth once existed in a locality that is now a true desert. Segments of giant fans, some faulted, have been built out on the dried-up lake basin. Some large s on the surface are so deeply weathered that a hammer blow will reduce them to . We are rapidly learning that certain are much more rapid than we have been wont to believe. But only recently have s attempted to determine by actual measurement process rates formerly the subject of general reasoning or speculation. Such measurement programs have documented the fact that rates of landscape change are greater than had earlier been suspected."
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Harvard University alumniMembers of the American Philosophical SocietyGeologists from the United StatesNational Medal of Science laureatesMembers of the United States National Academy of Sciences
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Luna Leopold
(October 8, 1915 – February 23, 2006) was an American , , and president in 1972 of the . Elected in 1967 a Member of the United States , he received the (1968), the (1973), the (1983), the (1991), the (1992), the (1994), and the Benjamin Franklin Medal in Earth and Environmental Science (2006; jointly with ).
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