• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12

The Extinction of the Dinosaurs - reviewing 3 theories.

Extracts from this document...

Introduction

image00.png

Basic Dinosaur Informationimage01.png

The proof of the dinosaur’s existence originally comes back to fossils (preserved remains of organisms) found in the ground. It is suspected that the first dinosaur fossils were discovered over 2000 years ago, by the ancient Greeks and Romans. However, the first recorded dinosaur fossil found was in 1676, discovered in England. [1] Since then, the continuous fossil discoveries gave evidence that at some point above land meat-eaters and plant-eaters roamed the earth eating and sleeping, and sometimes hunting. From two different sources[2], I have found out that the last of the dinosaurs were estimated to have become extinct over 65 million years ago. However, although both sources state the same information on how long ago the dinosaurs were alive, they are not very reliable sources, as they are not well known or professional. Since they were first discovered the question of why they are not alive today has been debated again and again, with no definite answers.

This Case Study

Many theories have been made, and I will include the major well known theories in this case study. I will include details about the theory as well as how believable they are in my opinion, and others opinion. I am aiming to find out details about each of the major theories, as well as how reliable and likely each theory is, and who believes in the theories. None of the theories that have been made are proved so this gives an opportunity to decide which of the possible theories that I believe to be the most likely. This case study is aimed at the general public, and for people who do not know very much about dinosaurs, but are interested. This could include students as intelligent as the average year 9 or above as well as adults.

image41.jpg

...read more.

Middle

Other than this piece of evidence, none other has been found, which may be why many scientists discard this idea as unlikely.

Arguments For

The theory has been closely linked by scientists with the popular asteroid theory, which suggests that it may be likely, as the asteroid theory is one of the most respected and believed theories. The theory also makes scientific sense when explained with the asteroid theory. The evidence linked with this theory backs up the claims made, but does not prove it.

Arguments Against

Although the evidence does supports the theory, the evidence backing the theory up does not explain why an ice age would have occurred. It also does not explain why some animals were left alive after the dinosaurs became extinct. The evidence is also not solid, and can be explained in other ways. The unreliability is shown in the lack of support by scientists.[5]

image05.png

image00.png

image43.jpg

This graph (taken from www.casualpc.com/HistoryInThrees/charts.htm) shows how there is no record of temperatures falling during or near the time of the dinosaur extinction.

image06.png

image07.pngimage00.png

There are plenty of theories to why the dinosaurs became extinct. I have simply reviewed the three theories that I believed to be most likely, and are most respected by scientists. The three theories I have studied all have valid arguments, and without the other theories I would believe each one. Each of the theories has interesting ideas, and there is scientific evidence for each one.

However, because each of the theories has scientific evidence, if one theory was correct, the evidence for the other theories would be explained in some other way. None

...read more.

Conclusion

The second period, starting 208 million years ago, was called the Jurassic period. This is when the first birds evolved. Dinosaurs were still alive and forming new species. As the huge continent Pangea began to form into smaller continents, the climate got cooler and rain was more frequent. This prompted more plant growth. There are thought to be forests of cycads, conifers and gingko, of which still exist now.

The third and final period was the Cretaceous period. This began 144 million years ago. The Cretaceous period ended when the dinosaurs became extinct, which was over 65 million years ago. When the dinosaurs died out, the first snakes and modern mammals were left.  During this period of time, the major continents had formed, apart from Australia and Antarctica, which were still joined together. The first flowering plants and trees evolved during this period.[6]

image19.png

image20.pngimage21.pngimage20.pngimage22.png

image33.pngimage20.pngimage32.pngimage20.pngimage31.pngimage30.pngimage37.pngimage29.pngimage20.pngimage28.pngimage37.pngimage37.pngimage20.pngimage27.pngimage37.pngimage26.pngimage25.pngimage35.pngimage24.pngimage20.pngimage36.png


[1]http://www.enchantedlearning.com/subjects/dinosaurs/dinofossils/First.shtml

[2]http://www.paleontology.esmartstudent.com/dinosaurs.html#when

http://www.enchantedlearning.com/subjects/dinosaurs/allabout/Myths.html

[3]http://www.aerospaceguide.net/whatisanasteroid.html

http://www.enchantedlearning.com/subjects/dinosaurs/extinction/Asteroid.html

http://www.enchantedlearning.com/subjects/dinosaurs/glossary/Alvarez.shtml

[4]http://library.thinkquest.org/22973/library/dieout.htm

http://www.wired.com/wiredscience/2008/12/deccantraps/

http://news.nationalgeographic.com/news/2006/10/061030-dinosaur-killer.html

[5]http://uktv.co.uk/eden/stepbystep/aid/586428

http://www.infowest.com/life/dinosaurs/extinct.htm

http://www.articlesbase.com/education-articles/dinosaur-extinction-one-giant-mystery-548019.html

http://tvnz.co.nz/view/news_technology_story_skin/432528%3Fformat=html

[6]http://www.kidcyber.com.au/topics/dino_eras.htm

...read more.

This student written piece of work is one of many that can be found in our GCSE The Earth and Beyond section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE The Earth and Beyond essays

  1. Science Case Study - Dinosaurs

    Though it was hunted the main reason for its extinction was pollution of its wetland habitat. But obviously because modern day humans were not around when the dinosaurs died we did not cause the mass extinction 65 million years ago; the cause must have occurred naturally.

  2. Green House Effect Dinosaur Extinction case Study

    This would have created a "greenhouse effect", the increase in temperature could have killed the tiny plankton responsible for converting most of the earth's carbon dioxide into oxygen which would further compound the problem.

  1. Conduct a research study looking at the detailed history of the stars.

    I have a great many questions - and hope that by the end of this research piece, I will have found all the answers. 'Twinkle twinkle little star, how I wonder...' what you are (the astrophysics and content of a star), how far you are (distance between Earth and stars),

  2. Free essay

    How did the Dinosaurs become Extinct?

    The Hell Creek formation is set just above the K-T boundary and represents the millions of years just before the extinction of the dinosaurs. Dr. Arens found that the number of different species of plants, especially flowering plants, declined significantly as one got closer to the boundary.

  1. What is a Diamond and where are they found?

    coal (2) coke (3) charcoal (4) lampblack (5) gas carbon etc. The largest Diamond The largest diamond yet discovered is the Cullinan diamond (3106 carats), found in 1905 at Pretoria. It was cut into two very large stones which are both a part of the British crown jewels.

  2. In the beginning God created the Heavens and the Earth.

    going through all the dates and time spans, suggested the earth was created about four millennia before the birth of Christ. His work was quite thorough, and can be checked by anyone with the patience to work out the genealogies given in the early Biblical records.

  1. Long ago, beings from all the local worlds, met up on Javan 3 (a ...

    And even now, the war continues as the darkness approaches. Only time will tell if any race survives this onslaught, or if anything resembling what once was will continue to be. "Captain, we have two cruisers on the north side, shields 40%.

  2. The mystery of Ragnarok

    The next thing he knew, he was lying on the ground with a giant red spaceship in front of him. He stood up, walked around the ship; there he saw it a slight opening in the side of the ship.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work