Tectonic plates

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Across
  1. 2. tectonics- a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle.
  2. 4. spreading- process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity
  3. 6. the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity
  4. 8. boundary- is a linear feature that exists between two tectonic plates that are moving away from each other.
  5. 10. the study of the record of the Earth's magnetic field in rocks
  6. 11. boundary- is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
  7. 13. Ring of Fire- a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur
  8. 16. Zone- is a region of the Earth's crust where tectonic plates meet
  9. 17. the rigid outer part of the earth, consisting of the crust and upper mantle.
  10. 18. crust- uppermost layer of the oceanic portion of a tectonic plate
  11. 19. boundary- is a type of fault whose relative motion is predominantly horizontal
Down
  1. 1. the upper layer of the earth's mantle
  2. 3. crust- the relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.
  3. 5. a crack split, or break in something.
  4. 7. ridges- an underwater mountain range, formed by plate tectonics
  5. 9. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
  6. 12. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
  7. 14. Arc- a curved chain of volcanic islands located at a tectonic plate margin, typically with a deep ocean trench on the convex side.
  8. 15. Supercontient