The Grand Canyon may seem to be a simple case of "river carves rock," but to geologists, its formation is still puzzling. Ira Flatow and guests... Solving The Riddle Of The Grand Canyon's Formation ...
Ivo Lucchitta, emeritus scientist, USGS, research associate, Museum of Northern Arizona, Flagstaff, Ariz. Richard Young, professor, geological sciences, State University of New York, Geneseo Geneseo, ...
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