The Ocean Floor

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Across
  1. 4. A deep flat area on the ocean floor
  2. 5. A deep canyon in the ocean floor
  3. 6. The steep slope from the shelf to the ocean floor
  4. 7. A line of volcanoes where two plates pull apart
Down
  1. 1. A curved chain of islands where two ocean plates collide
  2. 2. An underwater mountain made from a volcano
  3. 3. The shallow area from the beach to the ocean slope