Across
- 2. A liquid source of energy used in cars
- 4. A liquid source of heat
- 6. Something used to make things
- 8. A vapour(gas) source of heat
- 9. A radioactive metal used to produce heat
- 10. Like coal, gas or oil
Down
- 1. A liquid that removes gold from crushed gold ore
- 3. 1000 kilograms
- 5. The remains of dead plants and sea animals used to produce heat
- 7. A solid source of heat