Plate Tectonics

2. capable of being molded or changing shape
5. hypothesis that continents are in constant motion
9. magnets that orient themselves to point north
11. circulation of material caused by differences in temperature and density
12. mountain range located on the seafloor in the middle of the ocean
14. where two plates collide
16. new oceanic crust that forms at a mid-ocean ridge as old oceanic crust moves away
18. force created by the sinking of a plate, or slab, that pulls on the rest of the plate
19. ancient supercontinent, composed of land that forms today's continents
20. cold, rigid outermost rock layer of Earth

1. sinking of a denser plate below a more buoyant plate at a convergent plate boundary
3. where two plates slide by each other
4. theory that Earth's surface is made of rock plates that move with respect to each other
6. standard; or at a regular pattern
7. naturally preserved remains, imprints, or traces of organisms
8. event in which the magnetic field reverses direction
10. where two plates separate
13. magnets that orient themselves to point south
15. force created by rising mantle of ocean ridges that creates potential for plates to move away from the ridge
17. middle layer of Earth;between the crust above and the core below