Across
- 4. What is it called when light bends
- 5. A rock that is solidified lava.
- 11. The visible difference of different layers.
- 13. The process that causes volcanoes.
- 15. An instrument that records earthquakes.
- 16. The process that moves tectonic plates.
- 18. The theory of explaining Earth’s crust.
Down
- 1. Two regions that surround Earth at several thousand feet.
- 2. A rock that is formed by sediment.
- 3. A region that surrounds earth with a magnetic field.
- 6. A very hard igneous rock.
- 7. Outer most layer on the earth.
- 8. An elastic wave that is produced by an earthquake.
- 9. The science that deals with Earth’s structure.
- 10. A volcanic rock.
- 12. Where a tectonic plate sinks into the mantle.
- 14. A region with that makes island chains to form.
- 17. The process that causes earthquakes.