Across
- 3. Unwanted materials produced by human activity.
- 6. Protecting and preserving natural resources.
- 10. The way humans consume natural materials.
- 12. Energy from natural sources that do not run out.
- 16. Using resources without harming future generations.
- 17. Harmful substances released into air, water, or land.
- 19. The rise in Earth's average temperature.
- 20. Long-term changes in Earth's climate caused by human
Down
- 1. The clearing of forests by humans.
- 2. All living and nonliving things that surround organisms.
- 4. Gases released into the atmosphere by human actions.
- 5. The complete loss of a species.
- 7. Too many people living in an ared.
- 8. Reusing materials to reduce waste.
- 9. Energy resources like coal, oil, and gas.
- 11. The growth of cities and human settlements.
- 13. Communities of living and nonliving things.
- 14. The effect human activities have on the natural
- 15. The variety of life on Earth.
- 18. The destruction of natural homes for plants and animals.