The Theory of Plate Tectonics

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Across
  1. 3. a layer of a sedimentary rock or soil, or igneous rock where formed at the earth's surface.
  2. 5. makes up the most of the ocean floor and is the most common type of lava.
  3. 7. volcanic activity or phenomena.
  4. 8. the outer rigid layer of the earth.
  5. 9. topographic depressions of the seafloor.
  6. 10. consisting of a chain of mountains or hills.
  7. 11. the resistance that one surface or object encounters when moving one another.
  8. 13. a supercontinent that incorporated almost all the landmasses on earth.
  9. 14. arc curved line of islands.
Down
  1. 1. plural form of stratum.
  2. 2. a break or fracture in the ground that occurs when the Earth's tectonic plates move.
  3. 3. the sideways and downward movement of the edge of the earth's crust into the mantle beneath another plate.
  4. 4. a portion of the Earth's surface which experiences volcanism.
  5. 6. a continuous circulation of material and transfer of heat.
  6. 12. the degree of compactness of a substance.