Across
- 4. A piece of equipment, usually kept on a roof, that collects and uses the sun's energy to heat water or make electricity
- 6. The gradual warming of the air surrounding the Earth as a result of heat being trapped by pollution
- 8. The physical and mental strength that makes you able to do things
- 9. The thick, dark liquid from under the ground from which petrol is produced
- 10. ... (adj.) energy replaces itself naturally
Down
- 1. The kind of energy that is produced when the nucleus of an atom is either split or joined with the nucleus of another atom
- 2. The process of making air, water, soil etc dangerously dirty and not suitable for people to use
- 3. The air, water, and land on Earth, which can be harmed by man's activities
- 5. A clear substance like air that is burned for heating or cooking
- 6. Coming from the heat inside the earth (adj.)
- 7. Environmentalists would like to see ... fuels replaced by renewable energy sources.
- 11. Moving air, especially when it moves strongly or quickly in a current