Plate Tectonics

1. outermost layer of the earth
4. a break in the Earth's crust
6. boundary between two plates moving away from each other
8. layer between the crust and the core
13. theory that continents drift apart
14. the bending of rock layers
15. a pulling force
16. a region where an oceanic plate sinks down into the athenosphere
17. a squeezing force
19. the relatively thin part of the earth's crust which underlines the ocean basins
20. new lithosphere is created here

1. boundary between two colliding plates
2. as a slab sinks, it pulls on the rest of the plate with a force
3. the circulation of material caused by differences in temperature and density
5. boundary between two plates that are sliding past each other
7. capable of being molded or changing shape without breaking
9. soft layer of the mantle
10. outer most, rigid layer of the Earth
11. rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force
12. piece of the lithosphere that moves on the asthenosphere
18. 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