Plate Tectonics

3. Cause the plates to move; between the lithosphere and the asthenosphere
6. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
8. The name of the single landmass that broke apart about 225 million years ago
10. A layer of molten iron and nickel that surrounds the inner core of the Earth
11. A deep valley where two plates move apart
12. A rigid layer made up of the uppermost part of the mantle and the crust
13. A deep canyon on the ocean floor
14. thickest layer of the Earth; it consists of two layers - the lithosphere and the asthenosphere
16. the process by which molten material adds new oceanic crust to the ocean floor

1. German Scientist who developed the Theory of the Continental Drift in 1912.
2. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
4. theory that pieces of the Earth's lithosphere are in motion,driven by convection currents in the mantle
5. A soft layer of the mantle on which the lithosphere floats
7. Dense ball of solid material at the center of he Earth
9. the layer of rock that forms the Earth's outer surface.
15. A break or crack in the Earth's lithosphere along which rocks move.