Meteorite Craters and Impact Structures of the EarthDuring its five billion year history, Earth has been hit countless times by asteroids and meteorites. Over 150 crater producing events have been identified, and this 1994 book describes all 139 sites worldwide at which evidence of the impacts can be seen. They range in age from recent craters formed this century to the highly eroded billion year old ancient craters. Some are spectacular to visit, such as the Barringer Crater in Arizona, the ring