Many different theories exist as to why the dinosaurs went extinct. We know for sure most dinosaurs died out around 65 million years ago. The majority of scientists agree on a number of theories as to what brought the end of the dinosaurs. The most popular theory is that an asteroid ended the reign of the dinosaurs. Another theory, massive climate change in the pre-historic atmosphere, caused all the dinosaurs to die. Some scientists believe that mammals out competed dinosaurs for food and other resources. The last theory that dinosaurs died due to a large amount of volcanism comes up in scientists list of theories as well. Many different theories of why dinosaurs went extinct include extinction by asteroid, mammals outcompeting dinosaurs, climate change and volcanism.
The most popular theory of dinosaur extinction, the asteroid theory, says that dinosaurs died out because of a single, giant asteroid. They say that the asteroid that struck the earth near the Gulf of Mexico went 43,000 mph and spanned six miles wide (Erdman). When it hit the Earth the asteroid it left an enormous crater that measured 24 miles deep and 125 miles wide (Erdman). Just the impact of the asteroid destroyed the forests and landscape of the majority of North America due to its massive shock wave (Erdman). Many species went extinct when the asteroid hit, these species include dinosaurs, ammonites (certain ocean dwelling creatures), pterosaurs, and some plant groups dinosaurs, ammonites (mollusks related to the octopus and the chambered nautilus), pterosaurs, and certain plant groups. Although devastating, the asteroid did not wipe out all of the animals on Earth, it didn’t exterminate fish, frogs, turtles, birds, mammals and croco...
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"Eden Channel." How Did the Dinosaurs Become Extinct? N.p., n.d. Web. 12 Mar. 2014.
Erdman, Shelby Lin. "Scientists Reaffirm Theory That Giant Asteroid Killed Dinosaurs." CNN. Cable News Network, 09 Mar. 2010. Web. 07 Mar. 2014.
"Massive Volcanic Eruptions Could Have Killed Off the Dinosaurs." Wired.com. Conde Nast Digital, 15 Dec. 2008. Web. 12 Mar. 2014.
Norell, Mark, Lowell Dingus, and Eugene S. Gaffney. "Why Did Nonavian Dinosaurs Become Extinct?" Discovering Dinosaurs: Evolution, Extinction, and the Lessons of Prehistory. Berkeley: U of California, 1995. N. pag. Print.
Welsh, Jennifer. "Fossil Teeth Show Mammals Thrived Before Dinos Died." LiveScience. TechMedia Network, 14 Mar. 2012. Web. 14 Mar. 2014.
"What Killed the Dinosaurs?" PBS. PBS, 2001. Web. 06 Mar. 2014.
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