Science

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Across
  1. 3. esting meat and vegetation
  2. 7. small particle
  3. 8. mathematics of lines and angles
  4. 9. mathematical expression
Down
  1. 1. expert in astronomy
  2. 2. infectious life form
  3. 4. molten rock
  4. 5. biology
  5. 6. geology: fold
  6. 7. flammable gas