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This is the Barringer Meteor Crater in Arizona. The diameter is 1.2 kilomters, and it is 49,000 years old.
Courtesy of D. Roddy and LPI

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF