Across
- 2. the chemical element of atomic number 6
- 4. A resource that has a theoretically unlimited supply and is not depleted when used by humans
- 6. measure of the impact human activities have on the environment
- 7. A fossil fuel that forms underground from partially decomposed plant material
- 8. a natural fuel such as coal or gas, formed in the geological past
- 9. A form of energy caused by the movement of electrons
- 10. Pollutants that are released into the air
Down
- 1. A gradual increase in average global temperature
- 3. Situation in which heat is retained in Earth's atmosphere
- 5. A gas that is expelled from the body by the respiratory system