Plate Tectonics Vocab

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Across
  1. 5. a mechanism that contributes to plate motion in which cool, dense oceanic crust sinks into the mantle and pulls the lithosphere along
  2. 7. mountains formed in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent
  3. 10. the motion of matter from changes in temperature
  4. 14. the study of changes in Earth's magnetic field, as shown by patterns of magnetism in rocks that have formed over time
  5. 17. The rigid outer layer of Earth, including the crust and upper mantle
  6. 18. a region where the rigid plates are moving apart, typified by the oceanic ridges
  7. 20. the thin, rocky, outer layer of Earth
  8. 21. Floor Spreading the process which plate tectonics produce new oceanic lithospheres at the ocean ridges
  9. 22. A sound navigation and ranging tool that calculates ocean depth by recording the time of an energy pulse
  10. 23. a weak plastic layer of the mantle below the lithosphere
  11. 25. a mechanism that may contribute to plate motion; it involves the oceanic lithosphere sliding down the oceanic ridge due to gravity
Down
  1. 1. a boundary by which two plates move together
  2. 2. a chain of volcanic islands generally located a few hundred kilometers from a trench where subduction of one oceanic slab beneath another is occurring
  3. 3. a hypothesis that states the continents were once a supercontinent but, are now moving
  4. 4. the theory that proposes the Earth's outer shell consists of individual plates that interact in numerous ways. These plates can produce volcanoes, earthquakes, mountains, and the crust
  5. 6. topographic depression of the sea floor
  6. 8. a boundary where two plates slide past each other without creating nor destroying the lithosphere
  7. 9. A layer beneath the mantle (2260 km thick) containing liquid iron and generating Earth's magnetic field
  8. 11. The 2890 km thick layer of Earth below the crust
  9. 12. deep faulted structure found along the axes of divergent plate boundaries (can develop on seafloor or land)
  10. 13. the solid innermost layer of Earth (1220 km in radius)
  11. 15. one of the numerous rigid sections of the lithosphere that moves as a unit over the asthenosphere
  12. 16. the process by which oceanic crust sinks beneath a trench back to the mantle al a colliding plate boundary
  13. 19. a mass of hotter than normal mantle material that ascends toward the surface, where it can lead to igneous activity
  14. 24. a proposed supercontinent that began to break about 200 million years ago and formed today's landmasses