Across
- 4. to make decayed leaves, plants, or other organic waste into a mixture that can improve the soil's quality to help plants grow more quickly
- 7. related to a type of farming in which animals and birds can move around and eat freely, instead of being kept in a limited area
- 9. containing or relating to a dangerous form of energy produced by nuclear reactions
- 10. (of an object) able to be broken down by living organisms such as bacteria, which is then safe for the environment
- 11. animals,birds, and plants living in their natural habitat
- 12. relating to the environment
- 13. to remove unwanted or harmful substances from another substance
Down
- 1. any substance that is harmful to the environment
- 2. using more of something than can be replaced naturally
- 3. to make a place, substance, etc. dirty or harmful by adding dangerous material
- 5. amountof carbon dioxide produced by a person or company’s activity
- 6. (of natural substances such as oil) unprocessed and in raw form
- 8. place where people, plants, and animals live