Fossil fuels can be solid, liquid, or gaseous. The most important solid fuels are ____, ____ and ____. Coal ranks as one of the world’s main forms of fuel. It is also the ____ of all fossil fuels, but it is still used in several countries because it is ____, ____ and ____ The three main types of coal are: • ____ coal, the most important coal used for generating electricity, making coke and producing ____; • ____ coal, which has value as a fuel, because it ____ slowly, producing a lot of heat and very little smoke; • ____, which contains a great deal of ____ and produces less heat than anthracite and bituminous coal ____ was once man’s main fuel, but ____, ____ and other fuels have largely replaced it. ____,like lignite, contains a great deal of moisture and therefore is a ____ fuel Liquid fuels include ____ oil which is found in areas that are, or once were, covered by ____ Microorganisms that sank to the bottom of the ocean were covered by ____. Sediment changed into ____, and the organic matter changed into ____. Gas fuels include ____ coming from wells which are drilled deep underground. Natural gas, the cleanest fossil fuel, is a highly efficient form of ____ and compared to other fuels it has ____ impurities, it is less chemically complex, and its combustion generally results in ____ pollution. It is composed chiefly of ____, a colorless, odorless, flammable gas which represents an ideal fuel and an important energy source. When burned it gives off almost twice as much heat as the common manufactured gases, and leaves ____ or other waste. Petroleum, or crude oil, is often called ____ because it is so valuable to ____. It consists of a complex ____ of ____ of various molecular weights and other liquid organic ____ Petroleum is obtained mostly by ____ for oil. Once refined, it is used in a large number of consumer products, from ____ and ____ to ____ and chemical reagents used to make plastics and pharmaceuticals The use of ____ such as petroleum can have a negative ____ on the Earth’s biosphere, releasing ____ and ____ gases into the air and damaging ecosystems through events such as ____

FOSSIL FUELS

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