1. Sudy the vocabulary (key terms) from pg. 6,14,18,23.
2. What is convection current?
3.Study the evidence for sea-floor spreading.
4. Study the three main layers of the Earth.
5. What are the three types of heat transfer?
6. Write the enidence that supports Wegener's hypothesis about continental drift.
7. How does new oceanic crust form?
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