Across
- 3. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
- 6. Deep canyon on the ocean floor
- 9. German Scientist who developed the Theory of the Continental Drift in 1912.
- 10. Break or crack in the Earth's lithosphere along which rocks move
- 13. Single landmass that broke apart about 225 million years ago
- 14. Layer of rock that forms the Earth's outer surface
- 15. Dense ball of solid material at the center of the Earth
- 17. Cause the plates to move; between the lithosphere and the asthenosphere
- 18. Valley Deep valley where two plates move apart
Down
- 1. Rigid layer made up of the uppermost part of the mantle and the crust
- 2. Theory that pieces of the Earth's lithosphere are in motion driven by convection currents in the mantle
- 4. Plate boundary where two plates grind against each other, moving it different directions
- 5. Plate boundary where two plates move away from each other
- 7. Layer of molten iron and nickel that surrounds the inner core of the Earth
- 8. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
- 11. Soft layer of the mantle on which the lithosphere floats
- 12. Plate boundary where two plates move toward each other
- 16. Process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary