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Across
  1. 3. A trench in an ocean
  2. 6. the electrons on the outside of the atom
  3. 7. Plates moving together
  4. 8. Smaller than an era
Down
  1. 1. Plates moving apart
  2. 2. rocks replacing bones
  3. 4. 2 different alleles
  4. 5. Making 2 unique cells
  5. 9. Bigger than an period