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Across 4. This is what makes SOLAR panels work. 6. This topic 7. Energy from chemicals 10. Very runny and can be contained. 11. It lets in heat 13. A scale saying from acid to alkalis. 15. It does'nt let in heat. 16. This energy is what makes you hear. 17. Components that are joint together by wires. 18. It links components 21. It can hold a liquid. 22. All particles are together and they can't move. 23. Lemons have a bit of it. 24. Methane is a .......

Down 1. It has a soapy feeling and is blue when mixed with an indicator. 2. Something that tells you if something is an acid or alkali. 3. It is in food. 5. Energy that moves. 8. The way the elecricity goes round a circuit. 9. What something is made of. 12. Energy that humans consume. 14. It makes EVERYTHING. 19. The unit in which energy is measured. 20. It keeps you on the ground.