Across
- 1. a stretch of land, especially with regard to its physical features
- 4. science of relationships between living organisms and their environment
- 6. a natural resource or source of energy, not depleted when used:
- 8. the act of using up a resource
Down
- 2. convert waste into reuseable material
- 3. the action of becoming larger or more extensive:
- 5. economic activity,the processing of raw materials and manufacture of goods in factories
- 7. production and discharge of something, especially gas or radiation: