Across
- 4. A supercontinent containing all of Earth's land that existed about 225 million years ago.
- 8. the rocky outer layer of Earth
- 11. Sections of the Earth's crust that move due to convection currents in the mantle
- 13. device that can detect small changes in magnetic fields
- 16. A tectonic plate boundary where two plates collide, come together, or crash into each other
- 19. A theory stating that the earth's surface is broken into plates that move
- 20. circular current of warm material rising and cool material sinking that transfers heat
- 25. Boundary between tectonic plates in which the two plates move away from each other, and new crust is created between them
Down
- 1. when Earth's magnetic field changes direction because the flow in the outer core changes
- 2. theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches
- 3. transfer of heat by the movement of molecules in currents through a fluid
- 5. The hypothesis that the continents slowly move across Earth's surface
- 6. Earth's crust that makes up the continents
- 7. Boundary between two tectonic plates that are sliding past each other
- 9. the region where two tectonic plates meet
- 10. The area of magnetic force around a magnet
- 12. dense, metallic inner layer of Earth
- 14. direction of Earth's magnetic field
- 15. A deep valley that forms where two plates move apart
- 17. Earth's crust located under the ocean
- 18. One plate going under another plate
- 21. device that uses sound waves to calculate distances to underwater objects and the seafloor
- 22. transfer of heat by direct contact from a higher-temp to a lower-temp object
- 23. A deep crack in the ocean floor
- 24. the middle layer of the earth, between the crust and the core