Across
- 3. the ______ theory was proposed in the 1800s
- 5. the _______ ________ theory was proposed in 1912
- 7. the layer of the Earth that consists of molten iron and nickel
- 9. the outermost layer of the Earth
- 10. the name of the ancient supercontinent
- 12. the blanket of gases that surrounds the Earth
- 13. the name of a scientist who studies the Earth and its structure
- 14. the waves produced by earthquakes are called _____ waves
Down
- 1. the name of the ancient sea
- 2. the innermost layer of the earth
- 4. another name for the crust
- 6. the preserved remains of ancient creatures
- 8. the thickest layer of the Earth which is made of partly molten rock
- 11. the highest mountain range on land