Plate Tectonics
Across
- 2. a deep canyon on the ocean floor
- 5. name of the single landmass that broke apart about 225 million years ago
- 7. valley, a deep valley where two plates move apart
- 9. a rigid layer made up of the uppermost part of the mantle and the crust
- 13. drift, Alfred Wegener's hypothesis that the continents were once one huge land mass but have since then drifted apart
- 14. currents, cause the plates to move between the lithosphere and the asthenosphere
Down
- 1. Wegener, German Scientist who developed the Theory of the Continental Drift in 1912
- 3. boundary, a plate boundary where two plates move toward each other
- 4. thickest layer of the Earth, consists of two layers-the lithosphere and the asthenosphere
- 6. the layer of rock that forms the Earth's outer surface
- 8. boundary, a plate boundary where two plates move away from each other
- 10. a soft layer of the mantle on which the lithosphere floats
- 11. core, dense ball of solid material at the center of the Earth
- 12. a break or crack in the Earth's lithosphere along which rocks move
- 15. core, layer of molten iron and nickel that surround the inner core of the Earth