Seafloor Spreading Vocab

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Across
  1. 3. Melted, or molten, rock material beneath Earth’s surface
  2. 7. A phenomenon by which magma from Earth’s mantle comes up at the mid-ocean ridge and creates new oceanic crust
  3. 9. Huge pieces of crust that slowly move on the upper ductile part of the mantle
  4. 11. A depression of Earth’s surface in which an ocean lies
  5. 12. Deep and narrow depression in the seafloor where the subducted plate moves into the asthenosphere
Down
  1. 1. Two tectonic plates that move away from each other at a ________ boundary
  2. 2. The process in which a denser plate is pushed downward beneath a less dense plate when plates converge
  3. 4. An underwater mountain system formed by plate tectonics
  4. 5. Molten rock that emerges as a liquid onto Earth's surface
  5. 6. The thin solid outermost layer of Earth, is either continental(landmass) or oceanic(ocean floor)
  6. 8. Two tectonic plates slide past each other horizontally at a _____ boundary
  7. 10. Two tectonic plates move toward each other and collide at a ____ boundary