Across
- 3. agriculture _________________ soil with fertilizers and pesticides
- 7. fish farms can spread ________________ and parasites to fish in the surrounding ecosystem
- 8. agriculture uses more ___________ than any other industry in the U.S.
- 11. ___________ production has caused degradation of grasslands, erosion of topsoil, and pollution
- 12. _________________ agriculture is the least sustainable type of agriculture
- 13. the process by which land becomes dry and the production of topsoil decreases
- 14. topsoil erosion can deplete ________________ in the soil that plants need to grow
- 15. the top layer of soil that supplies nutrients for plant growth
Down
- 1. the act of clearing an area of forest
- 2. the variety of plants and animals that humans eat
- 4. soil __________________: accumulation of salts in the topsoil
- 5. _________________ is the most environmentally harmful human activity
- 6. using fertilizers and __________________ adds chemicals to the air, causing air pollution
- 9. ____________________ are being cleared to make room for cattle ranches and food production
- 10. soil salinization is caused by _____________ or watering crops