Agriculture

1. agriculture agriculture practices that preserve and enhance the environment.
3. found in developing countries, produces food for sale.
8. two harvests per year from one field.
11. the exchange of commodities.
12. areas where people have restricted access to food due to a lack of stores.
13. when people clear and burn land to plant crops, also known as slash-and-burn agriculture.
15. a patch of land cleared for planting through slashing and burning.
18. growing of fruits, vegetables, and flowers.
19. a form of subsistence agriculture where farmers put in a lot of effort to produce maximum yield of crops.
20. a sustainable agriculture method that protects the soil.
21. flooded field used to grow crops.

2. when humans switched to farming instead of hunting and gathering.
4. rotating the use of different fields from crop to crop to prevent soil exhaustion.
5. found in developing countries, produces food to feed a family.
6. the invention and rapid diffusion of more productive agriculture techniques.
7. the seasonal migration of livestock between mountains and lowland pasture areas.
9. a large commercial farm in a developing country that specializes in one or two crops.
10. the farm is part of a large food-production industry.
14. The ring surrounding a city from which milk can be supplied without spoiling.
16. a form of subsistence agriculture that herds domestic animals.
17. when farmland is deserted due to a lack of water.