Fossil fuels are best described as a.........
energy source. Select one: a. efficient b. nonrenewable c. clean d. renewable Coal was formed from........hundreds of millions of years ago. Select one: a. microorganisms b. diamonds c. nuclear chain reactions d. swamp plants Which of the following statements concerning tar sands is false? Select one: a. Tar sands are difficult to mine, but once brought to the surface require little energy to convert to oil. b. Waste water that remains after producing oil from tar sands is too contaminated for further use. c. Producing oil from tar sands releases more carbon dioxide that is released when the same amount of oil is produced from a conventional well. d. Tar sands in the past have often been uneconomical, but as demand for oil increases, this is changing.