Ameer Randolph
Fossil fuels are compound mixtures formed from the fossilized, buried remains of plants and animals that lived millions of years ago. The three fossil fuels are oil, natural gas, and coal. They are formed through the decomposition of organic matter, which turns into fossil fuels over millions of years. Fossil fuels are burned to produce electricity, heat, and transportation, but this has harmful effects on the environment and human health.
| Characteristics | Values |
|---|---|
| Composition | Compound mixtures made of fossilized plant and animal remnants from millions of years ago |
| Creation | Determined by the type of fossil, the amount of heat, and the amount of pressure |
| Sources | Coal, oil, natural gas |
| Colour | Crude oil can range from transparent golden yellow to deep black |
| State | Crude oil can be thick and viscous or light and fluid |
| Use cases | Fossil fuels are used for electricity, heat, and transportation |
| Environmental impact | Burning fossil fuels releases greenhouse gases (CO2), air pollutants (NOx and SO2), and toxins |
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What You'll Learn
Crude oil colour
Crude oil, also known as "black gold", is a fossil fuel that forms the basis of most fuels used to generate motion and power vehicles and modes of transport. It is also used to generate heat, electricity, and in the construction and chemical industries. Crude oil is obtained from the earth's surface by drilling and its colour varies from light yellow to brownish-black. It tends to darken when exposed to light. Fresh crude oil often has a yellow to green-blue fluorescence.
The colour of crude oil depends on its source, as it contains a large number of different chemical species. The part of this fraction that we call gasoline contains hydrocarbons with 4-12 carbon atoms and includes molecules like isooctane and butane. These molecules are largely transparent in the visible part of the spectrum or they might have very weak absorption towards the blue end, resulting in a clear appearance. However, crude oil also contains heavier molecules, such as asphaltenes, which are largely responsible for the black colour typically associated with crude oil.
The lighter and sweeter a crude oil is, the higher its quality. Sulfur content is a significant indicator of crude oil quality. Crude oils with high sulfur content are classified as sour and tend to have a disagreeable garlicky odour. Examples of high-quality crude oils include North Sea Brent and U.S. West Texas Intermediate (WTI). Crude oil from OPEC countries, including Iraq, Iran, Kuwait, Saudi Arabia, and Venezuela, is usually of slightly poorer quality and is therefore less expensive.
The process of refining crude oil into gasoline involves distillation, which separates the colourless gasoline from the heavier, coloured substances. This transformation from dark-coloured crude oil to colourless gasoline is how products like kerosene lamp oil are produced.
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Coal extraction methods
Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The specific type of fossil, the amount of heat, and the amount of pressure determine whether oil, natural gas, or coal is formed. Coal seams that are near the surface may be extracted using surface mining techniques such as open-cut, open-cast, open-pit, mountaintop removal, or strip mining. Mountaintop removal is a form of surface mining where the tops of mountains are removed to access coal seams. Opencast coal mining recovers a greater proportion of the coal deposit than underground methods as more of the coal seams in the strata may be exploited. Explosives are first used to break through the surface, then the overburden is removed by draglines or by shovel and truck. Once the coal seam is exposed, it is drilled, fractured, and thoroughly mined in strips. The coal is then loaded onto large trucks or conveyors for transport to either the coal preparation plant or directly to where it will be used.
Underground mining, also called deep mining, is used when coal is more than 200 feet below the surface. Some underground mines are thousands of feet deep, with tunnels extending miles from vertical mine shafts. Miners ride elevators down deep mine shafts and travel on small trains in long tunnels to reach the coal. Underground mining can be done using the room and pillar method, where pillars and timber are left standing to support the mine roof. The pillars can make up to 40% of the total coal in the seam. Retreat mining is a method where the pillars holding up the mine roof are extracted, allowing the mine roof to collapse.
The most economical method of coal extraction for surface mines is the electric shovel or drag line. The most economical form of underground mining is the long wall, which involves using two spinning drums with carbide bits that run along sections of the coal seam. Auger mining is a method where spiral drills bore tunnels into a highwall laterally to extract coal without removing the overburden. This method can achieve coal recovery rates of up to 60%. Contour mining is practiced where a coal seam outcrops in rolling or hilly terrain. This method consists of removing the overburden above the coal seam and then creating a bench around the hill.
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Natural gas formation
Fossil fuels are compound mixtures made of fossilised plant and animal remnants from millions of years ago. Natural gas, one of the fossil fuels, is primarily made up of methane. It is derived from both land plants and aquatic organic matter. The process that creates natural gas is the same as the process that creates oil, and is generally the same in most areas.
The first step in the formation of natural gas is the sinking of dead plankton, both phytoplankton (including algae) and zooplankton, as well as other soft and hard organic matter tissues (including microbes), to the bottom of an ancient ocean. This organic matter mixes with inorganic, clay-like materials that enter these oceans from streams and rivers, creating an organic-rich mud that can only form in still water environments. This mud cannot be exposed to too much oxygen, or else the organic matter would be decomposed by bacteria and disappear quickly.
Before the organic matter is destroyed, it is buried by more sediment and lithifies (turns into sedimentary rock), creating organic shale. If this shale is buried between 2 and 4 kilometres, its temperature increases due to its location in the Earth's interior. This increasing pressure and temperature transform the shale into a waxy material known as kerogen. Shale that contains this material is known as oil shale. If the temperature of the kerogen is greater than 90°C but lower than 160°C, the kerogen transforms into oil and natural gas. At temperatures above 90°C, the only product is natural gas or graphite.
Natural gas can be found in underground geological formations, often alongside other fossil fuels like coal and oil. Rock bodies that contain significant amounts of natural gas are known as reservoir rocks. For the gas to remain trapped in the reservoir, there must be some sort of thick, impermeable layer of rock to seal it in. Geological changes in the Earth's crust can bring these deposits closer to the surface, making them easier to access.
Natural gas can be released from subsurface porous rock formations through hydraulic fracturing or "fracking". In this process, well operators force water mixed with various chemicals through the wellbore casing into the rock. The high-pressure water breaks up the rock, releasing gas from the formation.
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Oil discovery
Oil, one of the three major fossil fuels, was formed over hundreds of millions of years from dead organic matter. Marine organisms called diatoms or microscopic sea organisms such as plankton died and fell to the sea floor, where they were buried under sand, silt, rock, soil, and water. The carbon present in these organisms turned into oil through decomposition by bacteria and the vast amounts of pressure and heat. As the earth shifted, oil and natural gas became trapped in the folds of rock.
Crude oil is a mixture of thousands of different molecules, primarily made up of compounds containing mostly hydrogen and carbon. Every crude oil deposit has a unique composition and proportion of these hydrocarbons, which determine its density and colour. Crude oil can be thick or thin and have various shades ranging from transparent golden yellow to deep black or even colourless.
Oil is often referred to as petroleum, which means rock oil or oil from the earth. Oil and petroleum are fossil fuels because they are mixtures of hydrocarbons formed from the remains of animals and plants that lived millions of years ago. The creation of fossil fuels such as oil, natural gas, or coal is determined by the type of fossil, the amount of heat, and pressure.
Despite the negative consequences, the oil industry continues to be influential, with lobbyists such as the American Petroleum Institute exerting significant influence on governmental policy and climate change denial. As reserves become harder to access, technology and geopolitical strategies evolve to manage extraction and control the supply of this valuable resource.
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Fossil fuels' environmental impact
Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure. The burning of fossil fuels has a number of harmful environmental impacts, with effects extending beyond the people using the fuel. These effects vary between different fuels.
Firstly, fossil fuel extraction is a dangerous and environmentally damaging process. Underground mining involves using heavy machinery to burrow deep into the earth’s surface, with miners climbing down deep pits to hack out the coal by hand. This is a risky job, as mines can collapse and poisonous or explosive gases can be released. Miners also suffer lung damage from long-term exposure to coal dust. Surface mining, or strip mining, tears away layers of soil and rock to reach the coal deposits, posing less risk to miners but causing more environmental damage. On land, it involves clearing all vegetation, and underwater, it displaces fish and other sea creatures.
Secondly, fossil fuels are a major cause of air pollution. All fossil fuels release CO2 when burned, accelerating climate change. Burning coal, and to a lesser extent oil and its derivatives, contributes to atmospheric particulate matter, smog, and acid rain. Fossil fuels also produce other hazardous air pollutants, including sulfur dioxide, nitrogen oxides, carbon monoxide, and mercury, which are harmful to both the environment and human health. Air pollution from fossil fuels can cause acid rain, eutrophication, damage to crops and forests, and harm to wildlife. In 2018, air pollution from fossil fuels was estimated to cost US$2.9 trillion, or 3.3% of the global gross domestic product (GDP). Globally, fossil fuel pollution is responsible for one in five deaths, with 350,000 premature deaths in the United States in 2018 attributed to fossil fuel-related pollution. Fossil fuel pollution disproportionately impacts communities of color and low-income communities, with Black and Hispanic Americans exposed to significantly more particulate matter pollution.
Thirdly, fossil fuels contribute to water pollution. Oil spills and fracking fluids contaminate water sources. Each fracking well uses between 1.5 million and 16 million gallons of water, and the resulting wastewater is often toxic, containing substances like arsenic, lead, chlorine, and mercury that can contaminate groundwater and drinking water.
Finally, the burning of fossil fuels releases greenhouse gases, such as carbon dioxide, which trap heat in the earth's atmosphere and contribute to climate change. Fossil fuels are responsible for almost three-fourths of the emissions from human activities in the last 20 years. Climate change has severe global impacts, including wildfires, droughts, extreme temperatures, and flooding. It also exacerbates food insecurity, negatively impacts ecosystems, and contributes to species extinction.
To address the negative environmental impacts of fossil fuels, various mitigating efforts have been proposed, including the adoption of alternative energy sources such as renewable energy, and the implementation of environmental regulations to limit emissions. While phasing out fossil fuels is crucial to preventing catastrophic climate change, the process is complex due to the significant role of fossil fuels in the global economy.
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Frequently asked questions
Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The three fossil fuels are oil, natural gas, and coal.
Crude oil can have a range of densities and colours, from thick and viscous to light and fluid, and from transparent golden yellow to deep black. Oil is originally found as a solid material between layers of sedimentary rock, like shale. Natural gas is usually found in pockets above oil deposits, or in sedimentary rock layers that don't contain oil. Coal is extracted from underground deposits or removed from entire layers of soil and rock.
Fossil fuels are burned to produce electricity, heat, and transportation. Oil is used as a lubricant, in plastics, cosmetics, and medicine, and is refined into other petroleum products such as gasoline, diesel, and jet fuel.
Fossil fuels are formed from the remains of plants and animals that lived millions of years ago. As the remains are buried deeper underground, they are subjected to increased heat and pressure, causing the molecules to break apart and turn into fossil fuels.
Burning fossil fuels releases greenhouse gases, air pollutants, and toxins, contributing to climate change and air pollution. Mining and drilling for fossil fuels can also harm the environment, uprooting and polluting ecosystems.
