Plate Tectonics Vocabulary

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Across
  1. 1. divergent boundary in the middle of the Atlantic Ocean
  2. 7. Which scientist is credited for first proposing Plate Tectonics Theory?
  3. 9. A __________ boundary occurs when two tectonic plates slide past each other.
  4. 11. When plates collide the plate that is __________ will subduct (go beneath the other).
  5. 13. convergence more dense oceanic plate dives under continental plate. forms a trench. causes volcanoes, and earthquakes (Andes Mountains)
  6. 14. Theory that great slabs or plates of Earth's outer layer float on a hot, semi-molten mantle. All plates are moving slowly and have rafted continents to new positions over time
  7. 17. Scientists believe that convection currents in the __________ is responsible for the movement of the plates that form the Earth's crust.
  8. 18. Underwater mountain ranges where the crust is spreading apart creating new ocean floor.
  9. 19. The ___ _______ Fault in California is a transform plate boundary.
  10. 24. the gradual movement of the continents across the earth's surface through geological time
  11. 25. What do you call the process of hot rock rising, cooling, and then sinking?
  12. 26. A deep depression of the sea floor caused by the subduction of one plate under another.
  13. 27. A __________ boundary occurs when two tectonic plates collide into each other.
Down
  1. 2. Areas where plates move away from each other, forming either mid oceanic ridges or rift valleys.
  2. 3. Areas where two plates grind past each other resulting in faults such as the San Andreas Fault. Earthquakes often occur at fault lines.
  3. 4. Areas where plates move toward each other and collide, causing uplift or subduction.
  4. 5. The MOST recently (newest) formed crust of the Earth would be found at a...
  5. 6. happens where 2 continental plates collide and push up creating mountain ranges
  6. 8. Tectonic Plates which are largely comprised of less dense granite
  7. 10. When a collision between two plates pushes the denser plate into and under the other plate __________ takes place.
  8. 12. When two continental plates collide large __________ will usually form.
  9. 15. Movements within Earth's mantle that cause tectonic plates to collide, separate, or slide past each other are called __________ __________.
  10. 16. proposed the theory of seafloor spreading
  11. 20. At a __________ plate boundary new crust is created as two or more plates pull away from each other.
  12. 21. single landmass that broke apart 200 million years ago and gave rise to today's continents
  13. 22. Divergent boundaries create new __________.
  14. 23. tectonic plate that lies under an ocean comprised of denser basalt