Across
- 2. pieces that make up the earth's crust
- 5. where two plates are moving away from each other and new crust is forming from magma
- 6. when the earths's magnetic field reverses itself
- 8. supercontinent that existed 200 million years ago
- 10. process by which new ocean crust forms along mid-ocean ridges and pushes old crust away
Down
- 1. theory that the continents slowly moved and are still moving to their current locations
- 3. a mountain chain on the ocean floor
- 4. the outer part of the earth, consisting of the crust and upper mantle
- 7. distance from the ocean surface to the ocean's floor
- 9. 7 great masses of land