1. Why do tectonic plates move? In the case of the African plate and South America plate, why are they continuously drifting apart?
2. Define an accretionary wedge and where it is likely to be formed. Explain how an accretionary wedge forms.
3. Explain the difference between a non-subduction and subduction zone. Briefly describe what happens at a subduction zone.
4. What evidence did Alfred Wegener use to support his hypothesis of continental drift? What additional evidence was added later (post-World War II) as oceanographers began to explore the ocean floor? How do these two ideas unite to form the theory of plate tectonics?
Your response should be at least 200 words in length.