Explain how an accretionary wedge forms.

2. Explain why Africa and South America are moving apart.

3. What is a hot spot? Explain how this forms a volcanic island chain such as that of the Hawaiian Islands.

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?