I believe an asteroid killed the dinosaurs. There is more evidence supporting this argument, than the other theory of drastic temperatures, due to greenhouse gasses, killing the dinosaurs. We discovered that the time a massive asteroid hit the earth was the same time that the dinosaurs became extinct. Also, melted rock that is only found in asteroids was discovered to have exploded on the earths biosphere, after moving through the atmosphere, and spread more than 100 miles from its origin. We also found fractured crystals which are only caused by an explosion, at the origin of the explosion. Also, dinosaurs seemed to have disappeared abruptly. If there were drastic temperature changes, then there would be more fossils.
http://www.pbs.org/wgbh/evolution/extinction/dinosaurs/asteroid.html
2001, WGBH Educational Foundation, and Clear Blue Sky Productions, Inc.
http://www.cotf.edu/ete/ESS/ESSspheres.html
2004, Wheeling Jesuit University
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