1. What is the name of the largest ocean on earth?
2. What are the two main metals in the earth's core?
3. Which is hotter, the center of the earth or surface of the sun?
4. What do you call molten rock before it has erupted?
5. What do you call it after it has erupted?
6. The Great Barrier Reef is found off the coast of which country?
7. What do you call a person who studies rocks?