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History shows that recent (in scientific terms) asteroid impacts have changed the face of the Earth. An iron-based asteroid about this size of 2012 DA14 blasted out Meteor Crater in Arizona which is about 4,000 feet wide and 700-800 fett deep. Another in 1908, hit Tuguska, Siberia. The asteroid that made the impact event, now know as the "Tunguska Event," was just slightly smaller than 2012 DA14, approximately 100 – 130 feet or 30-40 meters across. It destroyed about 750 square miles of forest in and around the Podkamennaya Tunguska River in what is now Krasnoyarsk Krai, Russia.