Across
- 4. advantage of slash and burn technique
- 6. pH 8-14
- 7. neutral solution turns universal indicator this colour
- 9. process of green plants making food
- 12. natural enemies of pests
- 13. nutrients added to soil to help plants grow faster and bigger
Down
- 1. green pigment needed to trap light
- 2. turns litmus paper and universal indicator red
- 3. herbicides kill ..
- 5. when the water turns green due to chemical fertilisers
- 8. used to kill pests
- 10. smoke from fire can cause this (unhealthy PSI)
- 11. gas given out during the process of making food