7th grade Ch. 9 Science vocab
Across
- 5. the circulation of material caused by differences in temperature
- 8. push rising mantle material at Mid-ocean ridge creates the potential for plates to move away from the ridge with a force
- 9. ridges the mountain ranges in the middle of the oceans
- 10. pull as a slab sinks, it pulls the rest of the plate with a force
- 11. spreading is the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
- 12. the cold rigid outermost rock layer
- 15. drift which suggested that continents are constantly moving on the surface of earth
- 16. the denser plate sinks below the more buoyant plate in the
Down
- 1. plate boundary forms where two plates separate
- 2. tectonics states that earth’s surface is made of rigid slabs of rock plates that move with respect to each other
- 3. continents where once part of a super continent
- 4. polarity a state which magnetized objects would reverse themselves to point south
- 6. polarity a state in which magnetized objects such as compass needles, will orient themselves to point north
- 7. plate boundary form where two plates collide
- 13. plate boundary forms where two plates slide past each other
- 14. reversal when the magnetic field reverses direction