Renewable and non-renewable energy

2. The kind of change we get if we combine oxygen, fuel and heat
3. The type of chemical change that occurs when microorganisms break down sugar into other substances
5. Energy source that can not be replaced (or would take millions of years to replace)
8. A thing made of iron that you can use for burning biomass in your home.
11. Combustion of coal or petrol releases ___________ energy.
14. The kind of energy released in thunderstorms.
17. Rabbits running, a river flowing and a ball rolling are all examples of ___________ energy.
18. Another word for evaporating water - it was once used to power old trains.
20. Water turns from liquid into solid state at _________ degrees Celsius.
21. Coal, natural gas and petroleum are types of __________ fuels.
22. The kind of energy that is transferred from a radiator.
24. When a substance combines with oxygen and forms a new substance.
25. Metals at room temperature are in _________ state.

1. These devices help turning kinetic energy in moving water or air into electrical energy.
4. Playing the trumpet transmits ____________ energy.
6. The smallest type of matter.
7. The type of energy that is released when you are riding a bike
9. If you want to use the energy from the sun, you can put these rectangular things on your roof.
10. On hot, sunny days, metal objects __________.
12. The gaseous substances created at combustion.
13. Energy stored in plants is called _____________.
15. The burning of non-renewable fuels creates ______________, which is bad for the environment.
16. Sources of energy that are unlimited, or are easy to replace.
19. Energy stored in substances such as uranium or plutonium.
23. The brown-red substance we can see on iron that has reacted with oxygen.