Across
- 5. the number of different plant and animal species in an area
- 8. This economist's view was that as population grows, humans will invent new technologies to allow more food and resources to be produced
- 9. when farm land is abandoned after losing its fertility
- 11. The move from primary sector to secondary and tertiary economies
- 12. the living layer of earth between the lithosphere and the atmosphere
- 15. the type of farming done for profit by governments or TNCs
- 17. The original or traditional people in a region
- 18. the non-living part of an ecosystem such as the atmosphere, water, rock and soil
- 20. The world's largest land biome found between 50 and 70 degrees latitude
- 21. the living part of an ecosystem such as flora and fauna
Down
- 1. decaying leaves and twigs
- 2. An indirect threat to rainforests
- 3. This 1798 theory stated that the population will eventually grow so large that resources will run out leading to a crisis.
- 4. the deliberate cutting down of forests to exploit forest resources
- 6. Nutrients like nitrogen move between the biomass, litter and soil as part of a continuous nutrient cycle which keeps both plants and soil healthy
- 7. when nutrients are washed out of the soil by water moving through it
- 10. natural stores for carbon containing chemicals.
- 13. Population growth in this continent has been dramatic since 1975
- 14. the highest vegetation layer of the tropical rainforest
- 16. this controls temperature and sunshine intensity
- 19. A large scale ecosystem