Across
- 2. The layer of Earth under the crust
- 6. Solid but bendable metal
- 7. A measure of how much mass there is in a given volume of water
- 8. Plates collide
- 11. This forms where pieces of Earth’s crust diverge on land
- 13. Wegener’s idea that the continents slowly moved over Earth’s surface
- 15. This begins at a mid-ocean ridge
- 19. Supercontinent about 300 million years ago
- 20. Plates slip past each other
Down
- 1. This forms long chains of mountains that rise up from the ocean floor
- 3. A deep underwater canyon
- 4. The theory of this states that Earth’s plates are in slow, constant motion, driven by convection currents in the mantle
- 5. Layer of rock that forms Earth’s outer skin
- 9. Plates divide
- 10. The crust and uppermost mantle
- 12. Any trace of an ancient organism that has been preserved in rock
- 14. Breaks in Earth’s crust where rocks have slipped past each other
- 16. When the ocean floor sinks beneath a deep-ocean trench and back into the mantle again
- 17. Caused at a transform boundary
- 18. These are broken into pieces separated by cracks