1. WARM-UP # 52 What is ONE piece of evidence that the continents were once all joined together? You know two – fit together like a puzzle and matching fossil evidence.

2. WARM Up # 53 Who proposed the theory of continental drift? Alfred Wegener proposed the theory of continental drift in 1912. He was a German scientist.

3. What is the theory of seafloor spreading and what scientist developed this theory? Warm-Up # 54 Scientists found that the youngest rocks are located at the mid-ocean ridges. It was discovered by Henry Hess.

4. Warm-Up # 55 Label the three major layers of earth on this diagram:

5. Warm-Up # 56 Seafloor spreading (Hess) and continental drift (Wegner) What are the two theories that when combined make up the theory of plate tectonics?

6. Warm-Up # 57 A. What theory of explains why the seafloor has both trenches and mid-ocean ridges? B. Evidence that tectonic plates are being created at divergent boundaries is that _______ rocks are found at the mid-ocean ridges and ______________rocks are found further away. C. What is the name of the one large supercontinent that existed millions of years ago? Seafloor spreading younger older Pangea

7. Warm-Up # 58 What is the name of the most famous transform fault (plate boundary) in the world? San Andreas Where is it? California What is a transform fault? A plate boundary where the plates grind past each other (not toward or away from each other).

8. Warm-Up # 59 What is hot, melted rock under the surface of the Earth known as??? MAGMA. Hot, melted rock on the surface of Earth is known as LAVA

9. Warm-Up # 60 What are climate clues???? Wegner found fossils of the same organism but in very different climates – like a tropical plant in a polar region or a glacial (glacier) deposit in a tropical region.