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Historical geology -- North America

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View Resource Ice Ages

This online exhibit developed by the Illinois State Museum provides information about the most recent glaciation over a large part of the Earth. To gain an understanding of ice ages, students will find answers to the questions: What are Ice Ages?, When did Ice Ages Occur?, and Why do Ice Ages Occur?. The Web site's section on the Midwest U.S. 16,000 Years Ago Exhibit features amazing images,...

http://www.museum.state.il.us/exhibits/ice_ages/index.html
View Resource NOVA: Mystery of the Megaflood

More than 75 years ago, Professor J. Harlan Bretz of the University of Chicago began to explore the dusty scablands of eastern Washington in an attempt to learn more about this rather unique area and also to determine how this land was transformed over time. Bretz soon came to the conclusion that the scablands were not the result of slow geological weathering, but rather the result of a massive...

http://www.pbs.org/wgbh/nova/megaflood/