Plate Tectonics
Across
- 1. A layer of molten iron and nickel that surrounds the inner core of the earth
- 5. break or crack in the Earth's lithosphere along which rocks move
- 6. Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
- 8. A plate boundary where two plates move toward each other
- 9. A deep canyon on the ocean floor
- 10. A soft layer of the mantle on which floats the lithosphere
- 12. dense ball of solid material at the center of the earth
- 13. The name of a single landmass that broke apart 225 million years ago
- 14. thickest layer of the earth; consists of two layers-the lithosphere and the asthenosphere
Down
- 2. A deep valley where two plates move apart
- 3. The layer of rock that forms the Earth's outer surface
- 4. The process by which the oceanic crust sinks beneath a deep-ocean trench back into the mantle at a convergent plate boundary
- 7. cause the plates to move; between the lithosphere and the asthenosphere
- 11. A rigid layer made up of the uppermost part of the mantle and the crust