Annotated Bibliography
Parsell, D.L.(2001, May 10). Mass Extinction That Led to Age of Dinosaurs Was Swift, Study Shows. National Geographic News. Retrieved April 10, 2011 from http://news.nationalgeographic.com/news/2001/05/0510_massex.html.
The time period that it takes for a mass extinction to occur is one of the determining factors into what actually caused the extinction. The extinction that occurred previously to the age of the dinosaurs is important as a comparison to what caused the extinction of the dinosaurs. This particular study has found that the previous mass extinction occurred very quickly, leading scientists to conclude that it was most likely caused by a cataclysmic event, such as an asteroid striking the Earth's surface. This event was important in shaping the way the dinosaurs evolved.
Britt, Robert Roy. (2004, October 14). In Extinction Debate, Dinosaurs and Science Writers are the Losers. Space.com. Retrieved April 10, 2011 from http://www.space.com/420-extinction-debate-dinosaurs-science-writers-losers.html.
The scientific world has been divided over the causes of the extinction of the dinosaurs. They fall into two different categories. One group believes that the dinosaur extinction occurred suddenly and the other believes that the dinosaurs were already declining when a catastrophic natural event caused a massive climate change that destroyed a large part of the life on this planet. Whichever you believe, the debate has raged on so long that people are becoming discouraged by the disagreement. It is very possible that we will never discover the truth behind the disappearance of the dinosaurs.
Handewerk, Brian. "Lost World" of Dinosaurs Survived Mass Extinction?(2009, May 1). National Geographic News. Retrieved April 10, 2011 from http://news.nationalgeographic.com/news/2009/05/090501-dinosaur-lost-world.html.
Scientists have discovered a small area in Colorado and New Mexico that contains dinosaur bones dated earlier than the believed mass extinction event that occurred between the Cretaceous and Tertiary period. The discovery of these bones has created a little controversy. Some scientists believe there was a pocket of dinosaurs that somehow survived the mass extinction while others believe that it is possible that the asteroid did not cause the mass killing of the dinosaurs. Either way, more study needs to be done.
Dalton, Rex. Gas may be to blame for extinction. (2007, October 31). Nature News. Retrieved April 10, 2011 from http://www.nature.com/news/2007/071031/full/news.2007.205.html.
A study of plankton found that there is a good possibility that gas released because of volcanic activity may have been the main cause of the extinction of the dinosaurs. The group the leading the charge in this theory has always suggested there is an alternative to the impact theory because of dating of core samples that have led some scientists to believe that the impact occurred 300,000 years prior to the mass extinction event. If this is the case, then the cause of the extinction could be blamed on volcanism.
Visual Aid Ideas
A map of the Chixculub Crater off of the Yucatan peninsula showing the impact size and area affected by the impact.
A sample of rock showing the layer of iridium that is believed to have been left by the impact of the asteroid.
A core sample and graph showing the age of the impact and comparison to the theorized date of the mass extinction.
A fossil sample dated after the believed impact theory.
Samples of rocks from the Deccan Traps in India dated to the mass extinction
Parsell, D.L.(2001, May 10). Mass Extinction That Led to Age of Dinosaurs Was Swift, Study Shows. National Geographic News. Retrieved April 10, 2011 from http://news.nationalgeographic.com/news/2001/05/0510_massex.html.
The time period that it takes for a mass extinction to occur is one of the determining factors into what actually caused the extinction. The extinction that occurred previously to the age of the dinosaurs is important as a comparison to what caused the extinction of the dinosaurs. This particular study has found that the previous mass extinction occurred very quickly, leading scientists to conclude that it was most likely caused by a cataclysmic event, such as an asteroid striking the Earth's surface. This event was important in shaping the way the dinosaurs evolved.
Britt, Robert Roy. (2004, October 14). In Extinction Debate, Dinosaurs and Science Writers are the Losers. Space.com. Retrieved April 10, 2011 from http://www.space.com/420-extinction-debate-dinosaurs-science-writers-losers.html.
The scientific world has been divided over the causes of the extinction of the dinosaurs. They fall into two different categories. One group believes that the dinosaur extinction occurred suddenly and the other believes that the dinosaurs were already declining when a catastrophic natural event caused a massive climate change that destroyed a large part of the life on this planet. Whichever you believe, the debate has raged on so long that people are becoming discouraged by the disagreement. It is very possible that we will never discover the truth behind the disappearance of the dinosaurs.
Handewerk, Brian. "Lost World" of Dinosaurs Survived Mass Extinction?(2009, May 1). National Geographic News. Retrieved April 10, 2011 from http://news.nationalgeographic.com/news/2009/05/090501-dinosaur-lost-world.html.
Scientists have discovered a small area in Colorado and New Mexico that contains dinosaur bones dated earlier than the believed mass extinction event that occurred between the Cretaceous and Tertiary period. The discovery of these bones has created a little controversy. Some scientists believe there was a pocket of dinosaurs that somehow survived the mass extinction while others believe that it is possible that the asteroid did not cause the mass killing of the dinosaurs. Either way, more study needs to be done.
Dalton, Rex. Gas may be to blame for extinction. (2007, October 31). Nature News. Retrieved April 10, 2011 from http://www.nature.com/news/2007/071031/full/news.2007.205.html.
A study of plankton found that there is a good possibility that gas released because of volcanic activity may have been the main cause of the extinction of the dinosaurs. The group the leading the charge in this theory has always suggested there is an alternative to the impact theory because of dating of core samples that have led some scientists to believe that the impact occurred 300,000 years prior to the mass extinction event. If this is the case, then the cause of the extinction could be blamed on volcanism.
Visual Aid Ideas
A map of the Chixculub Crater off of the Yucatan peninsula showing the impact size and area affected by the impact.
A sample of rock showing the layer of iridium that is believed to have been left by the impact of the asteroid.
A core sample and graph showing the age of the impact and comparison to the theorized date of the mass extinction.
A fossil sample dated after the believed impact theory.
Samples of rocks from the Deccan Traps in India dated to the mass extinction
No comments:
Post a Comment