science and technology 6.4

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Across
  1. 4. There are many windmills producing ... on the north coast of Poland.
  2. 7. A TV, a fridge and a washing machine need it to work.
  3. 10. Scientists are still looking for safer and cleaner ... .
  4. 12. It comes from under the ground. It's black and hard.
Down
  1. 1. Thomas Edison was a famous ... who invented a light bulb.
  2. 2. ... can be very dangerous
  3. 3. The black panels on the roof of my house use ... to produce electricity.
  4. 5. Columbus found a sea route to America. It was a great ....
  5. 6. Many cars use ... to operate.
  6. 8. You do experiments here.
  7. 9. It comes from trees. People burn it for heating.
  8. 11. It comes from under the ground. It can be used in cookers