PBS
Pbs Learning Media: What Killed the Dinosaurs?
This Evolution Web feature explores how evidence can support a variety of hypotheses surrounding the mystery behind the extinction of the dinosaurs.
University of California
Ucmp: What Killed the Dinosaurs?
This UC Berkeley site extensively covers the death of the dinosaurs. It includes history, theories, invalid hypotheses, and current arguments.
Other
University of Bristol: The Kt Event
This dinosaur site, containing eight different sections, includes topics such as: 101 crazy theories about dinosaur extinction, the pattern and timing of extinction, evidence for late cretaceous climatic change, gradual extinction and...
Virginia Tech
Virginia Polytechnic Institute: Greenhouse Dinosaur Extinction Theory
This comprehensive page discusses the Asteroid Impact vs. Volcano-Greenhouse dinosaur extinction debate. It was written by paleontologist, professor, and scientist Dr. Dewey McLean.
SEDL
Sedl: Extinction
This second lesson in a course on dinosaurs is devoted to extinction. There are group activities, discussion of the idea, and a way to assess what the students have learned.
CK-12 Foundation
Ck 12: Biology: Mesozoic Era the Age of Dinosaurs
[Free Registration/Login may be required to access all resource tools.] Covers the Mesozoic Era, the age of dinosaurs.
Smithsonian Institution
National Museum of Natural History: Paleobiology: Blast From the Past!
Examine evidence of a deep-sea core that provides evidence of an asteroid impact sixty-five million years ago, which may have contributed to the extinction of the dinosaurs.
Center for Educational Technologies
Earth Science Explorer: Dinosaur Floor
Take a tour of the dinosaur floor and you'll read several theories about why dinosaurs became extinct.
Australian Broadcasting Corporation
Australian Broadcasting Corporation: News in Science: Piece of Dinosaur Extinction Asteroid Puzzle Recovered
The first meteorite fossil discovered in this period when tests can be run on it, was found at Chicxulub in Northeastern Yucatan, Mexico. Scientists believe it is part of the meteorite which made the dinosaurs extinct.
Other
Who Dunnit to the Dinosaurs?
"One of the great mysteries in science is the extinction of the dinosaurs at the end of the Mesozoic Era some 65 million years ago. Who (or more likely what) caused it is unknown and a subject of great debate." Many theories are touched...
Other
Dinosaur Extinction: One More Hypothesis
"The survivals and extinctions at the close of the Cretaceous are such as might be expected to result from intensely hot winds such as would be generated by extra large meteoritic impacts." This article suggests that this theory should...
Other
University of Chicago: Dinosaur Extinction
This theory from the University of Chicago of dinosaur extinction revolves around the concept of plate tectonics, the movement of the continents over a sort of liquid around the planet.
Other
Dinosaurs' End, the Gravitational Hypothesis
The author of this site feels that there are too many problems with the current theories for why dinosaurs became extinct. He believes that his gravitational hypothesis is the correct answer, the dinosaurs suddenly got too heavy.
Other
Scientists Say Star Collision Caused Dinosaur Extinction
"Israeli scientists have a new theory on why the dinosaurs became extinct: cosmic radiation that bombarded the Earth following the collision of two neutron stars." This article discusses the details of the theory.