Across
- 3. Illegal movement of goods or people.
- 4. Ability to maintain or sustain something at a certain level or rate.
- 6. Contamination of the environment by harmful substances.
- 9. Film or television program presenting facts about a real-life situation.
- 13. Close observation, especially of a suspected spy or criminal.
- 14. Natural environment where an organism lives.
- 16. Complete disappearance of a species.
- 17. Community of living organisms interacting with each other and their environment.
- 18. Efforts to bring about social or political change.
- 19. Act of keeping something safe from harm or loss.
Down
- 1. Against the law or regulations.
- 2. Tools or methods used to solve problems.
- 5. Conditions of the atmosphere over a long period.
- 7. Public support for or recommendation of a particular cause or policy.
- 8. Variety of life on Earth.
- 10. Knowledge or perception of a situation or fact.
- 11. Species at risk of extinction.
- 12. Species crucial for maintaining ecosystem balance.
- 15. Protection and preservation of natural resources.
- 17. Process of acquiring knowledge or skills.