Across
- 2. natural; no chemicals or additives
- 3. the number of atoms that have the same number of nucleons
- 5. the farming of aquatic animals for food
- 6. another name for the water cycle
- 7. how salty an area is
- 10. wide, shallow steps used to provide standing room for spectators in a stadium
- 13. farming for commercial purposes only
- 16. diverse range of plants and animals in a place
- 17. the imaginary horizontal lines that go across the Earth to help with positioning
- 18. the act of seizing a land in an unlawful manner
- 22. the farming of a single crop in an area
- 23. farming different crops in an area to create more fertile soil
- 24. food that is modified at a genetic level, usually on the parent plant
- 25. the weather conditions prevailing in an area in general or over a long period.
Down
- 1. a measurement of pressure
- 4. a general term for electromagnetic rays emitted from the sun
- 8. a system to water a mass amount of plants
- 9. the regions of the surface and atmosphere of the earth or another planet occupied by living organisms.
- 11. able to last for a long time
- 12. a disease that is found among people in a certain area
- 14. people at all times have access to food
- 15. farmland that is ploughed and harrowed but left without plants
- 19. amount of light reflected from a surface
- 20. the relation of how biotic and abiotic things live together
- 21. a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.