Plate Tectonics

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Across
  1. 2. Long, deep, steep troughs in the seafloor where an oceanic plate sinks beneath an overlying plate.
  2. 4. One of Earth’s structural layers—a layer of weak, warm rock that flows slowly over geologic time.
  3. 6. The shaking of the ground that results when rock under Earth’s surface moves or breaks.
  4. 10. The process by which new lithosphere is created at midocean ridges as older lithosphere moves away.
  5. 12. The thick layer of dense, hot rock between Earth’s crust and core.
  6. 14. The study of the history, structure, and natural processes of planet Earth.
  7. 15. The Earth science that is concerned with the composition and structure of Earth.
  8. 16. Separate pieces of lithosphere that move on top of the asthenosphere.
  9. 19. Places where tectonic plates pull apart.
  10. 21. One of Earth’s structural layers—a shell of hot, liquid metal beneath the mantle and above the inner core.
  11. 22. Earth’s innermost layer, which is mostly iron and includes the inner core and outer core.
  12. 24. The region where an oceanic plate sinks into the asthenosphere at a convergent plate boundary.
  13. 25. Earth’s outermost structural layer, consisting of cool, rigid rock.
Down
  1. 1. The hypothesis that the world’s continents move slowly over Earth’s surface.
  2. 3. Earth’s surface layer, consisting of oceanic and continental crust.
  3. 5. The sinking of oceanic lithosphere into the mantle.
  4. 7. The process by which Earth formed layers according to density.
  5. 8. Places where tectonic plates come together.
  6. 9. Molten rock in Earth’s interior.
  7. 11. One of Earth’s structural layers—a solid sphere of hot metal, mostly iron, at the center of Earth.
  8. 13. The theory that Earth’s lithosphere is divided into large plates that move slowly around the globe.
  9. 17. Places where tectonic plates slide along beside one another as they move.
  10. 18. A global system of underwater mountains created by seafloor spreading.
  11. 20. The study of seismic waves, waves that travel through Earth as a result of an earthquake or other disturbance.
  12. 23. One of Earth’s structural layers—the lowest portion of the mantle, a zone of strong, rigid rock.