Plate Tectonics

3. a pulling force
4. new lithosphere is created here
6. outermost layer of the earth
9. layer between the crust and the core
10. capable of being molded or changing shape without breaking
13. piece of the lithosphere that moves on the asthenosphere
14. outer most, rigid layer of the Earth
17. rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force
18. the bending of rock layers
19. boundary between two colliding plates
21. theory that continents drift apart

1. a region where an oceanic plate sinks down into the athenosphere
2. boundary between two plates moving away from each other
5. as a slab sinks, it pulls on the rest of the plate with a force
7. soft layer of the mantle
8. the circulation of material caused by differences in temperature and density
11. a squeezing force
12. a break in the Earth's crust
15. boundary between two plates that are sliding past each other
16. the relatively thin part of the earth's crust which underlines the ocean basins
20. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans