2 billion years ago
natural uranium reactors

  • the evolution of first life forms passed already two billion years
  • the first continents were created on the Earth
  • spontaneous nuclear chain reactions took place in some regions rich in uranium (Oklo, Western Africa)
  • the era of big tectonic and climatic changes with the evolution of plant and animal species proceeded
natural nuclear reactor at Oklo in Gabon, Africa

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