Across
- 3. molten rock under Earth’s surface
- 10. natural creation or geologic feature on Earth
- 13. transform or transverse boundary; causes earthquakes
- 14. supercontinent that existed approximately 250 million years ago
- 16. large continuous landmass; seven on Earth
- 18. continuous underwater mountain chain
- 19. theory that Earth’s outer layer is made of moving plates
- 20. mountain that can vent lava and hot vapor
- 21. how heat flows; warm air rises cool air sinks
Down
- 1. convergent boundary; forms mountains
- 2. divergent boundary; makes sea-floor spreading
- 4. depression formed when tectonic plates drift apart on land
- 5. forms when a rift valley fills with water
- 6. process through which new ocean floor is made
- 7. remains of plants and animals from long ago
- 8. the pull toward the center of the Earth
- 9. shaking due to seismic activity at a fault
- 11. satellites and receivers used to determine location on Earth
- 12. steep-sided depression on ocean floor
- 15. edge of the continent that is underwater
- 17. large slabs of lithosphere that move