2. Warm-Up What are the 4 pieces of evidence that support the theory of Continental Drift? Time’s Up!

3. Plate Tectonics

4. Plates ◦ Divisions of lithosphere ◦ Moving on asthenosphere

5. Wegener – Continental Drift Theory Early 1900s Once single landmass - Pangaea Broke up – Laurasia, Gondwana Drifted to present location

6. Over the past 300 million years the continents have spread apart from each other.

7. Continental Drift Evidence For Wegener ◦ Fitting together of continents ◦ Similar things on distant continents  Fossils  R ocks

8. Sea-Floor Spreading Evidence for continental drift Mid-ocean ridges ◦ Tectonic plates moving separating ◦ New magma rises ◦ Form new oceanic crust ◦ Older crust pushed away

9. Magnetic Reversals Evidence for continental drift Molten rock ◦ Magnetic minerals ◦ Align with magnetic field Magnetic field reverses ◦ 177 times in 85 million years ◦ Last 600,000 years ago Recorded in rock ◦ Similar pattern to age of rocks

10. Causes for Plate Tectonics Convection ◦ Asthenosphere ◦ Heated rock  Expands and rises ◦ Cools  More dense

11. Inquiry Activity Follow the directions on the worksheet to complete the activity. When you are ready for shaving cream raise your hand and I will get you some.

12. https://www.youtube.com/watch?v=loFxYSHx Tf0

13. Plate Tectonics Movement ◦ cm/yr ◦ Measured by GPS Interact at boundaries – 3 types ◦ Collide ◦ Separate ◦ Slide past Earthquakes can occur at all

14. What will Denver be like? Earth’s History to 100 million years from now now Notice what Colorado/North America look like at the end of that video…

15. Short Constructed Response Using the information you have learned about continental drift, make a prediction about what Earth’s continents will look like in 100 million years. Make sure to support your claim with at least three pieces of evidence and provide commentary for each.