Across
- 1. study of magnetic record
- 4. theory that says the Earth is made of moving plates
- 5. fossil of seed fern
- 8. aquatic reptile found in freshwater rocks
- 9. boundary that moves apart
- 12. long narrow depression where crust is separating
- 13. line on a map that connects points that have same age
- 16. says Earth's continents had once been joined
Down
- 2. one plate descends under another plate
- 3. device that detects small changes in magnetic fields
- 6. scientist who proposed the continents were joined
- 7. boundary where plates push towards each other
- 10. describes a change in Earth's magnetic field
- 11. theory that explains continental movement
- 14. supercontinent
- 15. boundary that slides past each other