Plate Tectonics Vocabulary

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Across
  1. 2. An undersea mountain chain where new ocean floor is produced at a divergent plate boundary
  2. 4. Where a plate overtakes another and the denser plate goes underneath the less dense plate.
  3. 5. Earth's thickest layer made of hot rock and is less dense than the core, less hot, and has less pressure on it. Magma like consistency.
  4. 6. A long, narrow valley formed at a divergent continental boundary
  5. 7. The name given to the landmass when the continents were all joined as one supercontinent.
  6. 10. Circular currents in the mantle caused by the magma being heated by the core of the Earth.
  7. 11. Occur at all plate boundaries.
  8. 12. The thin outer layer of the earth that contains the earth's continents
  9. 14. Where two plates slide past each other.
  10. 15. A rigid layer made up of the uppermost part of the mantle and the crust.
  11. 17. The soft layer of the mantle on which the lithosphere floats.
Down
  1. 1. The innermost part of the earth; a dense sphere of solid iron and nickel at the center of Earth
  2. 3. A boundary where two plates are moving toward each other, going to collide.
  3. 8. Sections of the Earth's lithosphere that move
  4. 9. A boundary where two plates are moving away from each other.
  5. 10. Theory by Alfred Wegener that the continents on tectonic plates move.
  6. 13. A layer of molten iron and nickel (liquid) that surrounds the inner core of Earth
  7. 16. The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.