Science

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

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