Across
- 2. solid metal layer of the Earth
- 3. pieces of Earth's crust floating on top of mantle
- 4. liquid metal layer of the Earth
- 6. boundary where one plate pulls away from another plate
- 8. top layer of the Earth
- 9. viscous, semi-solid layer of the Earth
Down
- 1. boundary where one plate moves along the edge of another plate
- 5. boundary where one plate pushes against another plate
- 7. third planet from the sun