Across
- 3. when one tectonic plate moves underneath another
- 5. the natural process of wearing away by wind, water or other natural agents
- 6. molten rock below Earth’s surface
- 8. a scientific instrument that detects seismic waves
- 10. a molecule made of three oxygen atoms bonded together
- 11. Earth’s rigid outer zone (crust and upper mantle), made up of tectonic plates
- 15. a point in Earth’s crust where lava erupts
- 18. a sea wave caused by the displacement of water as a result of an earthquake or other disturbance
- 20. all the water on Earth
- 21. the point on Earth’s surface directly above the focus of an earthquake
Down
- 1. frozen soil in the Arctic
- 2. a break in Earth’s surface where blocks of rock slide past each other
- 4. all of the living things on Earth
- 7. the portion of Earth’s mantle underneath the lithosphere that can flow
- 9. a measure of the amount of destruction caused by an earthquake
- 12. Earth’s middle layer, made up of two layers
- 13. the origin of an earthquake
- 14. a measure of the energy released by an earthquake
- 16. the layer of gas that surrounds Earth and is 600 km thick
- 17. molten rock above Earth’s surface
- 19. an intense tropic storm that forms over warm oceans