1. Fossils are created of which were buried millions of years ago.
2. They are valuable because of their high content.
3. People burn fossils in order to produce .
4. One of the problems about fossils is that our resources are .
5. Renewable energy production does not threat to the earth.
6. It is very complicated or to produce renewable energy.
7. A synonym of expensive is .
8. Weather conditions have to be perfect for renewable energy, it is dependent on the .
9. As we were driving towards Austria, we saw a lot of farms.
10. The first cars used energy.
11. Water was by petrol in order to develop technologies.
12. I have an electric car, and I like it, however the battery too fast.