An asteroid impact two thousand years ago may have sent gigantic waves deluging what is now New York City. Most tsunamis are caused by underwater earthquakes and volcanoes, but the causes of 10% of them are unknown, and asteroids are thought to be one of these causes. For instance, scientists have found evidence that the Chicxulub impact in Mexico may have ended the age of the dinosaurs by drowning them all with gigantic waves. They may have wiped out the local Indians as well. In LiveScience.com, Charles Q. Choi quotes geologist Dallas Abbott as saying, "Our models suggest the tsunamis were up to 66 feet high when they entered the Hudson River. One possible reason why Indian tribes only moved into the area relatively recently is that the people who were once there were all wiped out. If you look at the predicted wave heights, there would have been few places to hide."
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