1. Intro Objective 04/10/2012 Summarize four different theories that explain why Earth’s climate has changed Make a list of things that could change Earth’s climates.

2. CLIMATE CHANGE

4. Climate Change  Ice Ages  A long period of climate cooling in which ice sheets cover large areas of the earth’s surface  Last one ended 10,000 years ago

5. Climate Change  Ice Age (continued) 1. Change in Orbit Shape 2. Change in Axis Tilt 3. Change in Wobble

6. Pictures can be drawn for the next two slides if there is extra time. However, it was not necessary this time, as students still had the “Climates of the World” picture to color, and the climatograph on Cleveland from the previous day.

7. Climate Change  Volcanic Eruptions  Eruptions can reflect the Sun’s rays, which will create cooler climates

8. Climate Change  Asteroid Impact Sunlight is blocked by debris in the atmosphere, causing massive climate change!

9. Climate Change  Global Warming  Greenhouse effect – carbon dioxide, water vapor and pollution absorb and trap heat

10. Climate Change  Summary  How are asteroids and volcanoes similar when it comes to climate change?

11. Objective 04/10/2012 Outro Summarize four different theories that explain why Earth’s climate has changed How has earth’s climate changed over time?