Energy

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Across
  1. 3. study rocks, minerals, and fossils
  2. 4. splitting of at least one uranium atom
  3. 5. brownish-black rock that is the youngest fossil fuel
  4. 7. silvery-white metal
  5. 8. one of the cleanest fossil fuels
Down
  1. 1. merging of two or more uranium atoms
  2. 2. combustible materials from the remains of plants and animals
  3. 6. known as petroleum or crude