Science Sleuth: Crossword Challenge

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