Chapter 3 - Plate Tectonics Extra Credit Crossword

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Across
  1. 3. A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
  2. 7. The process by which molten material adds new oceanic crust to the ocean floor.
  3. 10. A break in Earth’s crust along which rocks move.
  4. 11. Preserved remains or traces of an organism that lived in the past.
  5. 12. A plate boundary where two plates move away from each other.
  6. 13. A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
  7. 14. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.
Down
  1. 1. A plate boundary where two plates move past each other in opposite directions.
  2. 2. The hypothesis that the continents slowly move across Earth’s surface.
  3. 4. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at the convergent plate boundary.
  4. 5. The name of the single landmass that began to break apart 200 million years ago and gave rise to today’s continents.
  5. 6. A plate boundary where two plates move toward each other.
  6. 8. A deep valley that forms where two plates move apart.
  7. 9. The theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.