Science crossword

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Across
  1. 3. / Cars for me
  2. 4. / acid and alkaline
  3. 7. / Moon and earth
  4. 8. particles / random arrangement of particles
Down
  1. 1. / Solar system
  2. 2. / egg cell and sperm cell
  3. 5. / gases around the planet
  4. 6. / Unformed planets