Earth surface plate tectonics

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