Chapter 7 Vocab

2. where two plates seperate
4. force created by rising mantle of ocean ridges that creates potential for plates to move away from the ridge
7. where two plate collides
12. cold rigid outermost rock layer of the Earth
13. force created by sinking of a plate, or slab, that pulls on the rest of the plate
14. ancient supercontinent, composed of land that forms today’s continents
15. middle layer of Earth situated between the crust above and the core below
18. mountain range located on the seafloor in the middle of the ocean
19. conforming to a type, standard, or regular pattern
20. naturally preserved remains,imprints, or traces of organisms

1. event in which the magnetic field reverses direction
3. sinking of a denser plate below a more buoyant plate at a convergent plate boundary
5. Capable of being molded or changing shape
6. magnetic field in which magnets orient themselves to point south
8. hypothesis that continents are in constant motion
9. new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away
10. Theory that Earth's surface is made of rock plates that move with respect to each other
11. today’s magnetic field; magnets orient themselves to point north
16. where two plates slide by each other
17. circulation of material caused by differences in temperature and density