Across
- 2. one of several large landmasses
- 6. where heavier tectonic plates sink beneath lighter ones
- 8. a person that has expert knowledge of one or more of the natural or physical sciences
- 10. an area on Earth where two or more plates collide
- 14. the planet on which we live on
- 15. the formation of new areas of oceanic crust
- 18. the layer surrounding the inner core
- 19. a continent or other large body of land
- 20. an area or division
Down
- 1. the relatively thin part of the earth's crust which underlies the ocean basins
- 3. when two tectonic plates move away from each other
- 4. is the innermost geologic layer of the planet Earth
- 5. the rigid outer part of the earth, consisting of the crust and upper mantle
- 7. is a massive, irregularly shaped slab of solid rock that slowly moves over time
- 9. the outermost solid shell of a planet mantle the mostly-solid bulk of Earth's interior
- 11. is a natural or artificial feature of the solid surface of the Earth
- 12. hypothetical landmass that existed when all continents were joined
- 13. a supposition or a system of ideas intended to explain something
- 16. proposed a radical new idea, called continental drift
- 17. places where plates slide sideways past each other