Across
- 6. A deep valley where two plates move apart
- 7. German Scientist who developed the Theory of the Continental Drift in 1912.
- 8. A soft layer of the mantle on which the lithosphere floats
- 9. A layer of molten iron and nickel that surrounds the inner core of the Earth
- 10. The layer of rock that forms the Earth's outer surface
- 13. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
- 15. A deep canyon on the ocean floor
Down
- 1. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
- 2. Dense ball of solid material at the center of he Earth
- 3. Cause the plates to move; between the lithosphere and the asthenosphere
- 4. A plate boundary where two plates move away from each other
- 5. A break or crack in the Earth's lithosphere along which rocks move
- 11. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
- 12. The name of the single landmass that broke apart about 225 million years ago Theory of Plate Tectonics
- 14. A rigid layer made up of the uppermost part of the mantle and the crust