Plate tectonics

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Across
  1. 3. Ridge An undersea mountain chain formed at a divergent boundary.
  2. 4. Valley A deep valley that forms on land where two plates move apart.
  3. 6. A vent or fissure in the Earth's crust through which lava and gases erupt.
  4. 7. A deep depression in the ocean floor where subduction occurs.
  5. 8. A boundary where two plates move away from each other.
  6. 9. A break or crack in the Earth's crust along which movement occurs (common at transform boundaries).
Down
  1. 1. The process where one plate sinks beneath another at a convergent boundary.
  2. 2. Shaking and vibration at the surface from underground movement.
  3. 5. A boundary where two plates move toward each other.
  4. 7. A boundary where two plates slide past each other horizontally.