Across
- 2. Where air rises at the equator (low pressure) and sinks over the Tropics (high pressure).
- 6. Letting too many animals graze on land; grasses are removed, and soil is eroded.
- 7. Replanting trees.
- 9. At less than 30 degrees north or south of the equator. Hot deserts are found between 15 and 30 degrees north or south of the equator.
- 11. Dry
- 13. Poisons
- 15. Watering the land.
- 16. Water stored underground which can be pumped up and used by people.
- 17. The spread of the desert –land dries out, plants die and it turns into desert.
- 19. Growing too many crops year after year, so that the soil loses fertility (nutrients).
- 20. The winds blowing most frequently (often) from a particular direction.
- 21. Plants which store water in leaves or stems, eg. cactus.
Down
- 1. Cold air sinking, pressing down on the earth
- 3. Temporary streams
- 4. Provides for people now and preserves the environment for future generations.
- 5. Seeds lie inactive (waiting for years sometimes) until rains come.
- 8. Animals which come out at night and sleep during the day.
- 10. Technology that is affordable and easy to maintain for local people.
- 12. Steps cut into a hillside to produce ‘flat’ areas to farm.
- 14. People who have always lived in the area, tribes etc.
- 18. People who travel for food and water for their livestock