1. Understanding Earth’s History Why are trees, volcanoes and ice key to our understanding of earth’s history?

2. Let’s start with volcanoes…volcanoes

3. Get ready for your mind to be… BLOWN!

4. The Earth actually gets COLDER after big volcanic eruptions!

5. How do volcanic eruptions effect the Earth’s temp? 1. Dust, ash, glass, and rock are released into the air during a volcanic eruption.

6. 2. These things block the sun from reaching earth!

7. Clouds of ash can cover entire continents! In 2010, the Icelandic volcano Eyjafjallajokull erupted, spewing thousands of tons of ash into the air. 95,000 European flights were cancelled as a result of the eruption!

8. What information do Ice Cores & Tree Rings tell us? -Tell us how the CLIMATE has changed over time

9. Ice core- a sample of ice and snow that have built up over thousands of years -tell the amount of gasses in Earth’s atmosphere over time. Why do we care about ice?

10. What do ice cores tell us about the climate? Black or brown coloring- VOLCANIC ERUPTION (color caused by the ash) Yellowish color- Pollution in the air Bubbles- Carbon Dioxide (CO 2 ) is in the air (lots of bubbles means that it` was HOT!)

11. Why do we care about trees? Tree Rings: tell the amount of rain over time -Big Rings- A LOT OF RAIN -Skinny Rings- DROUGHTS

12. Why do we care about trees? Tree Rings -One ring= one year *Youngest- on the outside *Oldest- on the inside