Unit #5 Vocabulary Preview

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Across
  1. 1. A process where newly formed crust at the mid-ocean ridge pushes older crust away
  2. 6. The process that creates new sea floor as plates move away from each other at the mid-ocean ridges
  3. 8. A theory stating that the earth's surface is broken into plates that move.
  4. 11. A plate boundary where two plates move away from each other.
  5. 12. A plate boundary where two plates move toward each other.
  6. 13. The hypothesis that the continents slowly move across Earth's surface.
  7. 16. The idea that the more dense edge of a plate is pulled under a less dense edge of another plate
  8. 17. An underwater mountain chain where new ocean floor is formed
Down
  1. 1. A circle of volcanoes surrounding the Pacific Ocean.
  2. 2. The point where two tectonic plates meet
  3. 3. Molten rock beneath the earth's surface
  4. 4. Molten rock that reaches Earth's surface
  5. 5. The boundary between tectonic plates that are sliding past each other horizontally
  6. 7. The region where oceanic plates sink down into the asthenosphere.
  7. 9. Sections of the Earth's crust that move due to convection currents.
  8. 10. The movement of substances due to differences in density. Less dense move up while more dense move down
  9. 14. Preserved remains of once-living organisms
  10. 15. A supercontinent containing all of Earth's land that existed about 225 million years ago.