Posted Jan 25, 2008 at 10:30AM by Glen D. Listed in: Animals and Wildlife, Paleontology, Natural Disasters, Geology Tags: crater, Chicxulub crater, Yucatan peninsula, Texas
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Meteor impact - Image 1Most scientists now generally accept the theory of a meteor crashing into the Earth and wiping out the dinosaurs. If you imagine such a scenario as a giant flaming rock falling from the sky, nuking everything in sight, you may only be half-right.

The latest studies in the University of Texas have yielded 3D images of how the meteor fell into the Yucatan peninsula to form the undersea Chicxulub Crater. Scientists have learned from this simulation that the great dino die-off was actually "wetter" than earlier thought.

According to the study, the meteor probably dropped into deeper water than earlier assumed by scientists. This means that firestorms brought about by the actual blast killed most large land creatures, but it's the changes in the climate that finished off 70 percent of life on Earth.

Evidence from the crater reveals that the meteor that caused the dinosaurs to die had sulfur in it. This would mean that the heat and impact of the collision turned a lot of water into vapor. This vapor carried some of the meteor's sulfur, which produced acid rain and climate-cooling effects.

Acid rain, biologists say, would have had negative effects on the world's bodies of water. Microscopic organisms that aren't resistant to sulfur-based acids would have died, offsetting ecology, and later on, biodiversity.

Such a catastrophe would also have meant that the food supply balance in dinosaur habitats were drastically altered. Smaller dinosaurs not killed y the meteor's impact would have starved to death, effectively finishing most of the non-avian types.


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