Across
- 4. A type of igneous silicate rock
- 8. What makes something different
- 13. Theory that the crust is made of sections
- 15. Measures and charts seismic waves
- 16. The middle of Earth
- 17. an elastic wave in the earth produced by an earthquake
- 18. Rock created from heat and pressure
Down
- 1. Second layer of Earth
- 2. Plates moving away from each other
- 3. Igneous rock created by the cooling of lava
- 5. Changing direction
- 6. Rock created from hardened lava
- 7. a metric unit equal to 1,000 meters
- 9. Flow of charged particles from the Sun
- 10. Rock created from years of organic material piled up
- 11. The magnetic field created by Earth
- 12. The study of Earth’s structure and composition
- 14. Outermost layer of the Earth