Chapter 3 Vocab Crossword Puzzle

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