Efficient house & Jewellery

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Across
  1. 1. Is vinegar an acid or an alkali?
  2. 3. a type of energy that uses panels
  3. 7. Solar panels can work at night
  4. 8. Rust on a nail will cause it to become....
  5. 10. What gas is produced when an iron nail reacts with vinegar?
Down
  1. 2. an example of a fossil fuel
  2. 4. Happens when light moves through a glass block
  3. 5. are solar panels cheap or expensive?
  4. 6. when a red filter is held in front of the beam of white light, which wavelength of the spectrum will be seen?
  5. 9. a type of renewable energy