1. What is Earth's crust compared to in the text?, 2. What can happen when two pieces of the Earth's crust move and meet?, 3. What is a volcano?, 4. Where can you see different colors of rocks in the USA?, 5. Which ocean is the biggest ocean on Earth?, 6. How deep is the water in the deepest parts of the ocean?, 7. What are coral reefs made of?, 8. Where is the Great Barrier Reef?, 9. Where do rivers usually begin?, 11. Why are there no bridges on the Amazon River?, 12. What is the name of the long snakes that live in the Amazon?.

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