Agriculture

8. when humans switched to farming instead of hunting and gathering.
12. agriculture practices that preserve and enhance the environment.
14. the invention and rapid diffusion of more productive agriculture techniques.
16. when farmland is deserted due to a lack of water.
19. a form of subsistence agriculture where farmers put in a lot of effort to produce maximum yield of crops.
21. when people clear and burn land to plant crops, also known as slash-and-burn agriculture.

1. found in developing countries, produces food to feed a family.
2. found in developing countries, produces food for sale.
3. a form of subsistence agriculture that herds domestic animals.
4. the farm is part of a large food-production industry.
5. a large commercial farm in a developing country that specializes in one or two crops.
6. rotating the use of different fields from crop to crop to prevent soil exhaustion.
7. two harvests per year from one field.
9. areas where people have restricted access to food due to a lack of stores.
10. The ring surrounding a city from which milk can be supplied without spoiling.
11. flooded field used to grow crops.
13. a sustainable agriculture method that protects the soil.
15. the exchange of commodities.
17. growing of fruits, vegetables, and flowers.
18. the seasonal migration of livestock between mountains and lowland pasture areas.
20. a patch of land cleared for planting through slashing and burning.