Shark graveyard

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Across
  1. 2. very old or from long ago
  2. 4. ancient remains of once-living organisms
  3. 6. relating to the sea or ocean
  4. 7. what something can be used for
  5. 9. community of living organisms
Down
  1. 1. recognize something or someone
  2. 3. scientist who studies fossils
  3. 5. having a jagged or saw-like edge
  4. 8. to make something known
  5. 10. no longer existing or living