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Across
  1. 2. Population
  2. 6. footprint Ecological footprint
  3. 7. precipitation Acid precipitation
  4. 8. Biosphere
  5. 10. Abiotic
  6. 12. Ecosystem
  7. 13. factors Limiting factors
  8. 14. Sustainability
  9. 15. Equilibrium
  10. 16. Nutrients
Down
  1. 1. Photosynthesis
  2. 3. Biomass
  3. 4. Biotic
  4. 5. capacity Carrying capacity
  5. 9. niche Ecological niche
  6. 11. Sustainability