science vocab

8. The name of the single landmass that broke apart about 225 million years ago
10. Thickest layer of the Earth; it consists of two layers,the lithosphere and the asthenosphere
12. Theory that pieces of the Earth's lithosphere are in motion,driven by convection currents in the mantle
14. A plate boundary where two plates grind against each other, moving it different directions
15. Cause the plates to move; between the lithosphere and the asthenosphere

1. the process by which molten material adds new oceanic crust to the ocean floor
2. A plate boundary where two plates move away from each other
3. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
4. alfredwegener'shypothesis that the continents were once one huge land mass but have since then drifted apart
5. A layer of molten iron and nickel that surrounds the inner core of the Earth
6. Dense ball of solid material at the center of he Earth
7. The undersea mountain mountain chain where new ocean floor is produced; a divergent plate boundary
9. A break or crack in the Earth's lithosphere along which rocks move
11. A deep valley where two plates moveapart A deep canyon on the ocean floor
13. A plate boundary where two plates move toward each other