Across
- 2. Used to kill organisms that damage crops.
- 4. Fog mixed with smoke.
- 7. No longer existing species.
- 9. The protection of living things and resources.
- 10. Energy released from the nuclei of atoms.
Down
- 1. Unwanted or unusable substances.
- 3. Capable of being maintained or continued.
- 5. Layer that protects the Earth from dangerous radiation of the Sun.
- 6. The environment in which an animal or a plant lives.
- 8. Fuel formed in the Earth's crust from dead plants or animals.