ENERGY RESOURCES CROSSWPRD PUZZLE

3. a substance that reduces the transfer of heat.
7. economic activity concerned with the processing of raw materials and manufacture of goods in factories.
9. any of numerous greasy usually liquid substances from plant, animal, or mineral sources that do not dissolve in water.
10. A natural dark brown to black graphite like material used as a fuel, formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds.
11. Processing used materials into new products.
14. a large natural or artificial lake used as a source of water supply.
15. a barrier that stops or restricts the flow of surface water or underground streams.
18. capable of being renewed.
20. molten or semi-molten natural material from which all igneous rocks are formed.

1. fuel made from decomposing plants and animals.
2. the ability to do work or cause change; can be changed into different forms and can move between objects.
4. a device that can change the potential difference or voltage of an alternating current.
5. a machine for producing continuous power in which a wheel or rotor, typically fitted with vanes, is made to revolve by a fast.
6. Renewable energy from falling water or tides.
8. the introduction of contaminants into the natural environment that cause adverse change.
12. eliminated or discarded as no longer useful or required after the completion of a process.
13. type of fuel that is burned to produce heat and cook food.
16. cell A device that turns hydrogen into fuel.
17. a machine that converts kinetic energy into electrical energy.
19. energy generated from the burning of plants, wood, or agricultural waste.