Across
- 2. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
- 6. Theory that pieces of the Earth's lithosphere are in motion,driven by convection currents in the mantle
- 8. A deep canyon on the ocean floor
- 9. a layer of molten iron and nickel that surrounds the inner core of the Earth
- 10. The process by which molten material adds new oceanic crust to the ocean floor
- 11. Cause the plates to move; between the lithosphere and the asthenosphere
- 13. A plate boundary where two plates grind against each other, moving it different directions
- 14. A plate boundary where two plates move away from each other
Down
- 1. A break or crack in the Earth's lithosphere along which rocks move
- 2. A plate boundary where two plates move toward each other
- 3. Dense ball of solid material at the center of he Earth
- 4. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
- 5. A deep valley where two plates move apart
- 7. The name of the single landmass that broke apart about 225 million years ago
- 12. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary