Unit 6 Vocabulary 1

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