2. Dinosaurs Extinction

3. What is Extinction?  An animal species completely dies out.  There are no more individual members of this species.  Natural occurrence  99% of species that ever lived have gone extinct

4. Examples of Extinct Animals  Dodo bird  Wholly Mammoth  Saber Tooth Tiger

5. Dinosaur Extinction  Mass extinction  All species went extinct in a short amount of time  Happened all over the world

6. K-T Asteroid Theory  Science’s most popular theory of dinosaur extinction.  Large asteroid hit the earth and caused many natural disasters.  Debris clouded the sun, blocking its light and cooling the Earth.  All land animals over 55 lbs went extinct.

7. Other Theories  Volcanic Activity  Changes in Earth’s orbit  Greenhouse effect  Nearby Supernova

8. Video  http://www.youtube.com/watch?v=MSH2JBb2lWI

9. Sources  http://www.enchantedlearning.com/subjects/dinosaurs/ extinction/Other.html http://www.enchantedlearning.com/subjects/dinosaurs/ extinction/Other.html  http://dinosaurs.about.com/od/dinosaurglossary/g/ktext inction.htm  http://www.youtube.com/watch?v=MSH2JBb2lWI