APHUG Units 5-6

3. A city more than twice as large as the next largest in a country.
4. Farming method where land is cleared, used briefly, then left fallow.
10. A process of change in the use of a house from single-family to abandoned.
12. The cultivation of seafood under controlled conditions.
14. Process of middle-class people moving into deteriorated inner-city neighborhoods.
18. The process by which the population of cities grows.
19. Theory that explains how land value changes with distance from the CBD.
20. A city with a population over 10 million.

1. Degradation of land in dry areas due to human actions.
2. Model that explains the location of agricultural activities in a commercial economy.
5. Form of subsistence agriculture based on the herding of domesticated animals.
6. Agriculture using small inputs of labor relative to land area.
7. Farming for sale off the farm.
8. Agriculture using large amounts of labor or capital per area.
9. Farming to provide food for the farmer's family.
11. Rapid diffusion of new agricultural technologies during the 20th century.
13. A large node of office and retail activities on the edge of an urban area.
15. Settlements where people illegally establish residences on land they don't own.
16. Laws that regulate how land and property can be used.
17. The downtown heart of a city, marked by high land values.