Plate Tectonics (Chapter 7)

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Across
  1. 2. The denser plate sinks below the more buoyant plate in a process called ______________.
  2. 6. ______________________________ form where two plates collide
  3. 7. _____________ which suggested that continents are in constant motion on the surface of Earth.
  4. 8. ______________ states that Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other.
  5. 9. the circulation of material caused by difrences in tempecher is called ______________.
  6. 10. The cold and rigid outermost rock layer is called the _______________.
  7. 11. _______________________ forms where two plates slide past each other.
  8. 14. The mountain ranges in the middle of the oceans are called ______________.
  9. 15. Rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force called ________________.
Down
  1. 1. ______________________ forms where two plates separate.
  2. 2. As a slab sinks, it pulls on the rest of the plate with a force called _________.
  3. 3. ___________________ is a state in which magnetized objects would reverse directions and orient themselves to point south.
  4. 4. continents were once a supercontinent called _______.
  5. 5. _____________ occurs and the magnetic field reverses direction.
  6. 12. _________ is a state in which magnetized objects, such as compass needles, will orient themselves to point to the north.
  7. 13. _________________ is the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.