Across
- 3. the upper layer of Earth`s mantle
- 5. part of the Earth between the core and crust
- 6. breaks in the Earth`s crust
- 11. when continests slowly move over Earth`s surface
- 12. trace of an ancitent organism thats preserved in rock
- 14. plates come together
- 16. deep underwater conyons
- 17. pieces of Earth`s crust diverge on land
- 18. a measure of how much mass there is in a given volume of a substance
- 19. ocean floor sinks beneath a deep-ocean trench and back into the mantle
Down
- 1. when mid-ocean ridges continually add new material to the ocean floor
- 2. theory that Earth`s plates are in slow constant montion
- 4. super continet that existed about 300 million years ago
- 5. formed by convergent boundaries colliding together
- 7. the rigid outer part of the Earth
- 8. plates move apart from each other
- 9. current the flow that transfers heat within a fluid
- 10. plates slip past each other
- 13. crust the outermost layer of Earth
- 15. mountain ranges along the bottom of the Earth`s floor