Work Step by Step
Choice (d) is correct because the fracking electricity generation uses less coal. It uses less coal because fracking utilizes drilling and high-pressured water to release gas from rocks to convert to energy. No coal is involved in the fracking process, so there would be a decreased use of coal. Contamination is a result of fracking when the water mixture used to retrieve the gas from rocks contaminates the groundwater with the chemicals and sands that are incorporated in the mixture. Fracking results in lower natural gas prices because natural gas is readily available in the United States. While oil is harder to come by and is often purchased from other countries, natural gas harnessed from fracking is found locally and is lower in price.