Plate Tectonics

4. A soft layer of the mantle on which the lithosphere floats
5. Cause the plates to move; between the lithosphere and the asthenosphere
8. Thickest layer of the Earth
9. A break or crack in the Earth's lithosphere
10. a rigid layer made up of the uppermost part of the mantle and the crust
12. The name of the single landmass that broke apart long ago
13. A deep canyon on the ocean floor
14. German Scientist who developed the Theory of the Continental Drift in 1912.
15. A plate boundary where two plates move away from each other

1. the process by which molten material adds new oceanic crust to the ocean floor
2. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
3. The layer of rock that forms the Earth's outer surface
6. a deep valley where two plates move apart
7. A layer of molten iron and nickel that surrounds the inner core of the Earth
11. Dense ball of solid material at the center of the Earth