Across
- 4. the increase in the percentage of people living and working in urban areas
- 6. land that has rich and fertile soil for farming
- 8. something that contaminates, making air, land and water unsafe or unusable
- 12. this occurs when forests near cities are often cut down to make way for new factories and housing
- 13. when the population of a city is greater than the city's carrying capacity
- 14. crops which are grown from seeds whose DNA has been changed
- 15. a high-density informal urban settlement with inadequate housing and services
- 16. an urban area with more than 10 million people
- 17. a low-density settlement, near a larger urban area, mostly made up or single-family houses
- 18. a form of farming where farmers produce their own seeds or exchange seeds with other farmers in the community
- 19. the variety of life on Earth
- 21. a place where solid waste is buried under the soil
- 22. a person, group, or organization that has an interest in or a concern about something
- 23. the expansion of a city into previously undeveloped areas
Down
- 1. homes of animals
- 2. the brightening of the sky with human-made light
- 3. attractions that draw people to new areas
- 5. when megacities sprawl and merge
- 7. a wealthier country with access to technology and education, with generally high life expectancy
- 9. forces that drive people from their homes to search for new places to live
- 10. a less wealthy country with limited access to technology and education, and generally low life expectancy
- 11. the basic equipment and services that a city or country needs to function well
- 20. a map that shows the movement of people or goods using arrows