science

7. boundary: the boundary between tectonic plates that are sliding past each other horizontally
8. boundary: the boundary between two tectonic plates that are moving away from each other
11. the soft layer of the mantle on which the tectonic plates move
12. the sinking of regions of the earth’s crust to lower elevation
13. floor spreading: the process by which new oceanic lithosphere forms as magma rise toward the surface and solidify
16. the rising of regions of the earth’s crust to higher elevations
17. the central part of the earth below the mantle
18. the thin and solid outermost layer of the earth above the mantle
19. the bending of rock layers due to stress

1. drift: the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
2. boundary: the boundary formed by the collision of two lithospheric plates
3. the solid, outer layer of the earth that consist of the crust and the rigid upper part of the mantle
4. stress that occurs when forces act to squeeze an object
5. the layers of rock between the earth’s crust and core
6. tectonics: the theory that explains how large pieces of the earth outermost layer, called tectonic plates, move and change shape
9. stress that occurs when forces act to stretch an object
10. the strong, lower part of the mantle between the asthenosphere and the outer core
14. a break in a body of rock along which one block slide relative to another
15. plate: a block of lithosphere that consist of the crust and the rigid, outermost part of the mantle