Across
- 2. the edges are pushed into deep-ocean trenches
- 7. he noticed that different continents had matching landforms
- 10. the part of the Earth's crust that makes up the seafloor and is composed mostly of basalt
- 12. the process by which new seafloor forms
- 16. the innermost part of the earth
- 18. hot fluid material below or within the Earth's crust
- 19. a current in a fluid that results from convection
- 20. the outermost layer of rock
- 21. the layer of ingenious metamorphic and sedimentary rock that forms continents
- 22. rigid, solid layer made of rock
Down
- 1. boundaries where tectonic plates meet
- 3. the portion of the Earth's mantle where convection occurs
- 4. the moving pieces in the lithosphere
- 5. broke up into pieces that eventually "drifted" to the continent's present location
- 6. two tectonic plates move past one another in opposite directions
- 8. when two tectonic plates move away from one another or diverge
- 9. the part of earth's crust
- 11. when tectonic plates move toward each other and collide
- 13. hot molten rock erupted from a volcano
- 14. the hypothesis that today's continents were once a part of a single landmass
- 15. a liquid layer of the earth located between the mantle and inner core
- 17. the mostly-solid bulk of Earth's interior