Evolution of the atmosphere

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Across
  1. 2. – Microscopic pores on the underside of a leaf
  2. 4. – Movement of carbon through atmosphere, organisms and Earth
  3. 6. - Gas taken in by plants for photosynthesis
  4. 8. – Increase in Earth’s average temperature
  5. 9. – Gas released as a by-product of photosynthesis
  6. 10. – Process where water vapour leaves the leaf
  7. 12. – Non-renewable energy sources releasing CO₂ when burned
  8. 13. – Mineral needed by plants to make proteins
Down
  1. 1. – Human activity increasing CO₂ levels into the atmosphere
  2. 3. – Process of breaking down of dead organisms releasing CO₂
  3. 4. – Green pigment that absorbs light energy
  4. 5. – Process where heat is trapped in Earth’s atmosphere
  5. 7. – Main product of photosynthesis used for energy
  6. 11. – Greenhouse gas released by landfills