Earth surface plate tectonics

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Across
  1. 2. long chains of undersea mountains
  2. 3. an ancient supercontinent
  3. 4. valley formed on the ocean floor due to collision plates
  4. 7. continents move around on Earth’s surface
Down
  1. 1. lithospheric plates move over this
  2. 3. how the pieces of Earth’s surface move
  3. 5. the process of lithospheric plate sinking into mantle
  4. 6. a lithospheric plate that forms floor of the ocean