What is the heaviest natural thing on earth?

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  2. #element
  3. #uranium
  4. #occurs
  5. #depends
  6. #count
  7. #technetium
  8. #occurring
  9. #heaviest
  10. #there
  11. #large
  12. #quantity
  13. #naturally
  14. #elements
  15. #atomic
  16. #number