Across
- 3. period during which thick ice sheets cover vast areas of land
- 4. hot liquid
- 6. solidified lava
- 7. mostly-solid bulk of Earth's interior
- 9. sideways or downward movement of techtonicplates
- 11. rigid, outermost shell of a terrestrial-type planet
- 13. a supercontinent that incorporated almost all the landmasses on Earth
- 14. coarse-grained igneous rock
- 16. scientist that formulates the theory of tectonic plates
Down
- 1. fine-grained extrusive igneous rock
- 2. seven massive plates
- 4. common type of carbonate sedimentary rock
- 5. a natural science about the earth
- 8. liquid layer of the earth
- 10. outer layer of the earth
- 12. solid layer of the earth
- 15. a person who studies the earths porpeties