Science

1. The layer of rock that forms the Earth's outer surface
2. A deep canyon on the ocean floor
4. Wagner German Scientist who developed the Theory of the Continental Drift in 1912.
6. A soft layer of the mantle on which the lithosphere floats
8. boundary A plate boundary where two plates move away from each other
9. A rigid layer made up of the uppermost part of the mantle and the crust

1. boundary A plate boundary where two plates move toward each other
3. valley A deep valley where two plates move apart
5. A break or crack in the Earth's lithosphere along which rocks move
7. boundary A plate boundary where two plates grind against each other, moving in different directions
10. zone The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary