1. People use …..to run machines, heat and cool their homes. A. energy B. water C. pollutants D. fuels 2. ………is a device used to change the power of the water into electricity. A. Windmill B. Solar panel C. Machine D. Dam 3. If the resource can be replaced quickly, it is called……… A. renew B. non- renewable C. renewable D. renewed 4. Fossil fuels will be …….within a relatively short time A. released B. recycled C. exhausted D. extinct 5. I believe that wind power can be an…….source of energy A. optional B. alternative C. altered D. exhausted 6. ____ heat comes from deep inside the earth. A. Geothermal B. Solar C. Nuclear D. Hydro 7. All fossil fuels are ____ resources that cannot be replaced after use. A. unlimited B. renewable C. available D. non-renewable