Science Sleuth: Crossword Challenge

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Across
  1. 3. – Makes up Earth's air.
  2. 6. – Development of life forms.
  3. 9. – Positive particle in atom.
  4. 10. – Earth's life-supporting region.
  5. 13. – Uncharged particle in atom.
  6. 15. – Plants making food.
  7. 16. – Related to the Sun.
  8. 17. – Basic unit of life.
  9. 18. – Creates magnetic field.
  10. 20. – Stores genetic info.
Down
  1. 1. – Nuclei combine, release energy.
  2. 2. – Bond by sharing electrons.
  3. 4. – Force pulling objects down.
  4. 5. – Organism's complete genes.
  5. 7. – Element with different neutrons.
  6. 8. – Atoms bonded together.
  7. 11. – Two or more elements joined.
  8. 12. – Essential for respiration.
  9. 14. – Smallest matter unit.
  10. 15. – Charged state of matter.
  11. 19. – Negative particle in atoms.