Across
- 2. The 20th century was a period of increasing use of … fuels.
- 3. Which power is an alternative for the problem?
- 5. What replaced horse drawn carriages?
- 7. What was the big solution to the increasing demand of energy?
- 8. How big is the energy demand that we have to cover?
Down
- 1. What is solar power more specifically? Solar …
- 4. For what is the wind industry also favorable except the energy?
- 6. What is the problem with the wind resources? It is to …