Across
- 1. Periodic table element: FE
- 2. Heat causing rocks to rise and fall
- 5. Periodic table element: NI
- 6. Made of hard, solid rock
- 8. Made of soft, solid rock
- 9. A material that forms most of Earth's crust
Down
- 1. Made of solid iron and nickel
- 3. Made of liquid iron and nickel
- 4. Waves caused by earthquakes
- 7. Causes Earth's layers to form one on top of another.