Across
- 5. People who are concerned about protecting the environment.
- 6. deadly or poisonous
- 7. something that can cause harm
- 9. an outbreak of disease that spreads quickly
- 11. a bacterium, virus, or other microorganism that can cause disease.
- 12. Amount of water vapour in the air
Down
- 1. It is warming the earth's surface
- 2. the totality of surrounding conditions
- 3. a sudden violent shaking of the ground
- 4. the weather conditions prevailing in an area in general or over a long period.
- 8. A chemical or physical process that kills pathogenic organisms in water, air, or on surfaces.
- 10. Complex system of relationship between living things and their environment.