Plate Tectonics

3. a break in a body of rock along which one block slides relative to another
6. properties that involve a reaction to an applied load strength, ductility, hardness, impact resistance, and toughness
7. tectonic plates collide and form mountains.
11. the center of the earth
12. tectonic plates slide past each other creating earthquakes
14. the hypothesis that states the continents once formed a single landmass, broke up, and drifted to their present location
16. stress that occurs when the forces act to squeeze an object
18. the only liquid layer of the planet
19. the middle layer of the earth which is also the largest
20. the soft plastic-like layer of the mantle

1. the sinking of regions of the earth's crust to lower elevations
2. solid outer layer that consists of the crust and the rigid upper part of the mantl
4. the nature of something's ingredients or constituents
5. tectonic plates move apart
8. a block of lithosphere
9. the thin, solid, rigid outermost layer of the earth
10. the theory that explains how large pieces of the earth's crust move and change shape
13. the inner most layer of the earth which is solid and made out of solid iron and nickel
15. the strong, lower parts of the mantle
17. the process by which new oceanic lithosphere forms and magma rises toward the surface and solidifies