Chapter 4 vocabulary

3. crust Makes up the continental landmass
5. Theory that the lithosphere is made up of plates that float on the asthenosphere
6. Huge ocean surrounding Pangaea
7. Zone of mantle beneath the lithosphere that consists of slowly flowing solid rock
8. Movement of the ocean floor away from either side of a mid-ocean ridge
11. Undersea mountain range with a steep, narrow valley along its center
14. A region where one lithospheric plate moves under another
15. When the oceanic crust sinks under the continental crust
16. Piece of land with a geologic history
17. The continents connected to create one giant landmass
19. Two plates moving away from each other
20. crust Material on the ocean floor
21. Two plates grinding past each other

1. The transfer of heat through the movement of heated material
2. Theory that continents are a patchwork of pieces of land that have individual geologic history
4. Chain of volcanic islands formed along an ocean trench
9. Hypothesis stating that the continents once formed a single landmass, broke up, and drifted to their present locations
10. Thin outer shell of the earth consisting of the crust and the rigid upper mantle
12. Steep, narrow valley formed as lithospheric plates separate
13. The direct collision of plates
18. of microplate tectonics Theory that continents are a patchwork of pieces of land that have individual geologic histories