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2. A plate boundary where two plates move away from each other
6. A break or crack in the Earth's lithosphere along which rocks move
8. Dense ball of solid material at the center of he Earth
9. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
10. A deep valley where two plates move apart
11. A plate boundary where two plates move toward each other
12. A deep canyon on the ocean floor
13. A plate boundary where two plates grind against each other, moving it different directions

1. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
3. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
4. The name of the single landmass that broke apart about 225 million years ago
5. A layer of molten iron and nickel that surrounds the inner core of the Earth
7. Cause the plates to move; between the lithosphere and the asthenosphere