Plate Tectonics

2. the force exerted on a surface divided by the total area over which the force is exerted
3. Vibrations that travel through Earth carrying the energy released during an earthquacke
5. the layer of rock that forms Earth's outer surface
7. a plate boundary where two plates move toward each other
10. a large stream of moving water that flows through the oceans
11. a break or crack in Earth's lithosphere along which the rocks move
12. a rigid layer made up of the uppermost part of the mantle and the crust
13. the soft layer of the mantle on which the lithosphere floats
14. the theory that pieces of Earth's lithosphere are in constant motion, driven by continental currents in the mantle
15. a dark, dense, igneous rock with a fine texture, found in oceanic crust
16. the amount of mass of a substance in a given volume; mass per unit volume
17. a well-tested concept that explains a wide range of observations
19. the layer of hot, solid material between Earth's surface and core
20. a usually light-colored rock that is found in continental crust

1. a plate boundary where two plates move past each other in opposite directions
4. the name of the single landmass that broke apart 200 million years ago and broke into today's continents
6. the process by which molten material adds new oceanic crust to the ocean floor
8. a plate boundary where two plates move away
9. the direct transfer of energy through space by electromagnetic waves
10. the hypothesis that the continent slowly move across Earth's surface
18. the direct transfer of thermal energy from one substance to another substance that it's touching