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- Vicki Hansen, a geology professor at the University of Minnesota Duluth, answers questions from freshman science students in the Oxford Hills Comprehensive High School auditorium. Hansen is a former instructor of Oxford Hills science teacher Sarah Kamilewicz, who arranged the video chat. Hansen is the author of a recent theory stating that plate tectonics, the slow movement of continents, was set in motion by comets and asteroids crashing into the Earth millions of years ago.
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