Across
- 2. a farmer who grows enough food for himself
- 5. people moving out of a country
- 6. people moving into a country
- 8. the max amount of population an area can support
- 10. land on which crops can be grown
- 11. the most important inorganic molecule we need
Down
- 1. the process of energy that powers the sun
- 3. wearing away of soil by wind or water
- 4. a species maximum growth rate
- 7. a source of energy that will not run out
- 9. food shortage that causes starvation