8S Lessons 5.3-5.5 Vocabulary Crossword

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