Across
- 5. an elevation of the seafloor, 1000 m or higher, either flattopped or peaked
- 6. a fixed source of abundant rising magma that forms a volcanic center that has persisted for tens of millions of years
- 8. a sudden motion or shaking in Earth, caused by the abrupt release of slowly accumulated strain
- 9. fluid rock that comes out of a volcano
- 11. a rigid, thin segment of the crust and part of the upper mantle
- 12. the point on Earth’s surface directly above the focus of an earthquake
- 13. Earth’s crust and the uppermost part of the mantle
- 15. a general term for all elastic waves in Earth produced by earthquakes or generated artificially by explosions
Down
- 1. a continuous mountain range extending through the North and South Atlantic Oceans, the Indian Ocean, and the South Pacific Ocean
- 2. the deep central cleft in the crest of the midocean ridge
- 3. a scientist who studies the materials, processes and history of Earth
- 4. a vent in the surface of Earth through which magma and associated gases and ash erupt
- 7. a theory in which the lithosphere is divided into a number of plates that move relative to one another
- 10. the point of an earthquake within Earth where rupture first occurs to cause an earthquake
- 14. naturally occurring molten rock material generated within Earth