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Chapters: Meteor Crater, Panther Mountain, Santa Fe Impact Structure, Chesapeake Bay Impact Crater, Upheaval Dome, Weaubleau-Osceola Structure, Odessa Meteor Crater, 38th Parallel Structures, Flynn Creek Crater, Red Wing Crater, Alamo Bolide Impact, Kentland Crater, Cloud Creek Crater, Manson Crater, Avak Crater, Middlesboro Crater, Sierra Madera Crater, Victoria Island Structure, Wetumpka Crater, Serpent Mound Crater, Glover Bluff Crater, Rock Elm Disturbance, Haviland Crater, Wells Creek Crater, Beaverhead Crater, Toms Canyon Impact Crater, Calvin Crater, Des Plaines Crater, Decaturville Crater, Crooked Creek Crater, Snows Island Crater, Glasford Crater, Ames Crater, Newporte Crater, Marquez Crater. Source: Wikipedia. Pages: 104. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher’s book club where you can select from more than a million books without charge. Excerpt: Meteor Crater – The crater was created about 50,000 years ago during the Pleistocene epoch when the local climate on the Colorado Plateau was much cooler and damper. At the time, the area was an open grassland dotted with woodlands inhabited by woolly mammoths, giant ground sloths, and camels. It was probably not inhabited by humans; the earliest confirmed record of human habitation in the Americas dates from long after this impact. The object that excavated the crater was a nickel-iron meteorite about 50 meters (54 yards) across, which impacted the plain at a speed of several kilometers per second. The speed of the impact has been a subject of some debate. Modeling initially suggested that the meteorite struck at a speed of up to 20 kilometers per second (45,000 mph), but more recent research suggests the impact was substantially slower, at 12.8 kilometers per second (28,600 mph). It is believed that about half of the impactor’s 300,000 metric tons (330,000 short tons) bulk was vaporized during its descent, before…More: http: //booksllc.net/?id=56208
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