Across
- 3. the energy released during nuclear fission or fusion, especially when used to generate electricity
- 4. a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane
- 8. a form of rain that is unusally acidic, meaning that it has elevated levels of hydrogen ions
- 10. naturally occurring water that is not salty, and is suitable for consumption if clean or processed
- 11. the introduction of harmful materials into the environment
- 12. thermal energy in the Earth's crust
- 13. the draining away of water (or substances carried in it) from the surface of an area of land
- 14. a silvery white, weakly radioactive material
- 16. a group of wind turbines in the same location used to produce electricity
- 19. the process of claiming something back
- 20. capable of being renewed
- 21. a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities
Down
- 1. the science, art, or practice of cultivating the soil, producing crops and raising livestock
- 2. the action of clearing a wide area of trees
- 5. radint light and heat from the Sun that is harnessed to generate electricity
- 6. the generation of electricity using flowing water
- 7. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 9. a brown deposit resembling soil, formed by the partial decomposition of vegetable matter in wet acidic conditions
- 15. organic matter used as a fuel, especially in a power station for the generation of electricity
- 17. a large area covered chiefly with trees and undergrowth
- 18. a naturally occuring solid material from which a metal or valuable mineral can be profitably extracted