Across
- 4. drift hypothesis- that continents are in constant motion
- 5. plate boundary- where two plates separate
- 6. naturally preserved remains, imprints, or traces of organisms
- 9. ridge- mountain range located on the seafloor in the middle of the ocean
- 12. circulation- of material caused by differences in temperature and density
- 13. cold, rigid outermost rock layer of Earth
- 16. ancient supercontinent, composed of land that forms today’s continents
- 18. spreading- new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away
- 19. tectonics- theory that Earth’s surface is made of rock plates that move with respect to each other
Down
- 1. middle layer of Earth situated between the crust above and the core below
- 2. reversal- event in which the magnetic field reverses direction
- 3. conforming to a type, standard, or regular pattern
- 7. sinking of a denser plate below a more buoyant plate at a convergent plate boundary
- 8. capable of being molded or changing shape
- 10. push- force created by rising mantle of ocean ridges that creates potential for plates to move away from the ridge slab pull- force created by sinking of a plate, or slab, that pulls on the rest of the plate
- 11. plate boundary- where two plates collide
- 14. polarity- magnetic field in which magnets orient themselves to point south
- 15. plate boundary- where two plates slide by each other
- 17. polarity- today’s magnetic field; magnets orient themselves to point north