"Invalid Hypotheses" and "Current Arguments":  Read these two documents prepared by UC, Berkeley on their site called DinoBuzz.   Dinosaurs Fact Sheet: This site, presented by ST. Louis Science Center, provides learners online texts that are easy to read and understand. Click the numbered buttons at the bottom of the web page to read the seven theories about dinosaur extinction.   "Dinosaur Extinction: Other Theories about the K-T Extinction":  This fun provoking online text is presented by Enchanted Learning Software.   "Dinosaur Extinction--The Volcano-Greenhouse Theory":  Dewey McLean, the professor of Virginia Polytechnic Institute, explains why the volcano-greenhouse theory is more preferable than any other dinosaur extinction theories.   "Antarctic Fish Fossils Fuel Asteroid Impact Debate": This article is posted by National Science Foundation. Other Links   "Fresh Angle on Dead Dinosaurs" "The Dinosaur Extinction" "The Many Myths of Dinosaur Extinction" Strange Science The Unnatural Museum