Coal forms from the physical and chemical alteration of organic peat moss. This process, called coalification, takes hundreds of years to complete. During coalification, peat moss undergoes a series of transformations as... More »

Coal is nonrenewable because it comes from fossil fuels, and fossil fuels take millions of years to form. Fossil fuels are the product of decomposed materials and organisms that have been heated and pressurized for milli... More »

Coal is a sedentary rock that varies in composition. It forms as organic material compressed under the layers of soil and more organic material above it. More »

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Common examples of fossil fuels include natural gas, oil, peat and coal. These fuels are organic biomass extracted from the remains of primitive organisms that roamed the planet millions of years ago. More »

Coal can burn at temperatures greater than 3500 degrees F. Since burning is a chemical reaction that is dependent on the presence of oxygen, the more air there is, the higher the possible temperature that coal can reach.... More »

Coal, oil and natural gas all produce heat energy when burned. These fuels were formed by the remains of organisms that existed millions of years ago. Heat from these fuels is used to convert water into steam, which is t... More »

Some examples of limited resources include coal, nuclear, natural gas, metal ores and oil. Limited resources are basically those resources that take a relatively long time to replenish. Unlimited resources or renewable r... More »