Across
- 4. the variety of kinds of life in an ecosystem
- 7. gases sent into the air
- 8. the use of machinery to make farming more productive: agricultural...
Down
- 1. the part of the farming industry devoted to raising animals: ... sector
- 2. the permanent destruction of forests
- 3. the industry of farming
- 5. being able to be maintained
- 6. the use of a resource