Science

123456789101112131415
Across
  1. 3. inhale
  2. 4. exhale
  3. 6. a lot of this gas is in the stratosphere
  4. 8. light shining on plants
  5. 9. vary in concentration
  6. 12. Conduction convection and radiation
  7. 14. When water dissolves it becomes this
  8. 15. cow farts
Down
  1. 1. Nitrogen oxygen and argon
  2. 2. symbol:N Atomic number:7
  3. 5. the sky
  4. 7. gram and pounds
  5. 10. a gas that is everywhere
  6. 11. elements in group 18 on periodic table are this
  7. 13. Methane is one of these