Across
- 3. ridge / An underwater mountain range
- 7. tectonics / The theory that plates move land at the speed that your fingernails grow
- 8. / A large supercontinent from long ago
Down
- 1. / Land going into the ground
- 2. boundary
- 4. trench / Very deep areas in the ocean
- 5. plates / Tectonic plates at the bottom of the ocean
- 6. drift / The slow movement of continents