Across
- 3. When Wegener's idea was that the continents slowly moved over earths surface
- 4. Any trace of an ancient organism that has been preserved in a rock
- 7. When mid-ocean ridges add a new material to the ocean floor
- 8. A measure of how much mass there is in a given volume of a substance
- 10. When resulting volcanoes create a string of islands
- 11. When Plates Slip past eachother
- 13. A major belt of volcanoes
- 14. Long chains of mountain that rise up from the ocean floor
- 16. When the ocean floor plunges into canyons
Down
- 1. Plate motions in a theory
- 2. When plates come together or converge together
- 5. The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
- 6. The flow that transfers heat within a fluid
- 9. An area where material from deep within earth's mantle rises through the crust and melts to form magma
- 12. When the continents were joined together
- 15. When plates move apart or diverge from eachother