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The Extinction of Dinosaurs - Asteroid Theory
strata after about 500-600 My ago; dinosaurs and giant reptiles were on the land by 200 My ago. After a decade of searching, scientists in 1990 identified the crater associated with this material.
Coaching Theory, The Digital Divide Theory,
The extinction wiped out the becoming a Successful Student dinosaurs while most mammals, turtles, crocodiles, salamanders, and frogs survived. Walter Alvarez and colleagues brought the asteroid collision theory to attention in 1980 which links the extinction event to a Bolide (an object that cannot be described as a comet, asteroid or meteorite) hitting the earth at just the right speed to cause cataclysmic damage. Ever since the fossil sequence began being mapped around 1800, geologists noticed that striking "breaks" occurred in the sequence, when one group of fossilized species gave way to other groups during short intervals. The volcanists lost ground Renne explained. The second greatest break is the one that we have discussed, 65 My ago, caused by an asteroid impact.
Many families of brachiopods and sea sponges disappeared. In 1998, the Arizona state school board recommended that the term "evolution" be dropped from public school curriculum in the state, only to reverse themselves some months later after a public outcry. These are all things we have to think about as humans on the planet today.".