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4. A break or crack in the Earth's lithosphere along which rocks move
6. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
7. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
9. A layer of molten iron and nickel that surrounds the inner core of the Earth
12. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
14. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
15. A deep canyon on the ocean floor

1. Thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
2. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
3. German Scientist who developed the Theory of the Continental Drift in 1912.
5. A soft layer of the mantle on which the lithosphere floats
8. The layer of rock that forms the Earth's outer surface
10. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
11. A deep valley where two plates move apart
13. A rigid layer made up of the uppermost part of the mantle and the crust