What are differences between natural gas, coal, and oil?
All may be considered “fossil fuels”, but they differ in time and conditions of formation and chemical composition.
Coal is obtained primarily through mining, while oil and natural gas are extracted from wells drilled into the earth from land-based or sea-based platforms. Coal is a solid, oil is a liquid, and natural gas is a vapor (gas). Coal and oil form from deposits of animal and vegetable matter deep in the ground at conditions of high pressure over many years. Natural gas is also formed during those processes, but it can also be generated relatively quickly by organic material decomposition, as in municipal landfills and waste treatment plants.
Natural gas is mostly composed of methane with traces of ethane and other light hydrocarbon gases, while coal is a complex mixture of numerous different long-chain hydrocarbons. Oil is also a mixture, but it is made up of somewhat shorter hydrocarbon molecules than can be separated into products like gasoline, naphthas, kerosene, and diesel fuels.
According to the most popular theory, dead organic material builds up on the bottom of rivers, swamps, and oceans, combining with mud and sand. As more sediment atop the organic layer over time, heat and pressure cause it to change into a dark, waxy substance called kerogen. If the kerogen molecules are left undisturbed, they eventually break apart into shorter, lighter molecules made almost entirely of carbon and hydrogen atoms, which will eventually turn into petroleum or natural gas, depending on how liquid or gaseous this mixture is. https://tutor.hix.ai
Large in situ coal fields are thought to have originated from massive plant life growing in swamps or swampland with shallow lakes; therefore, extensive accumulations of vegetable matter that are subjected to widespread submersion by sedimentary deposits are necessary for the development of substantial in situ coal measures. https://tutor.hix.ai
Coal is essentially vegetation in strata; it is always "longer-chain" hydrocarbons; oil can form from plant and animal decomposition, but oil has relatively shorter hydrocarbon chains, which makes it a liquid rather than a solid. More information and other options can be found in that last reference.
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Natural gas is a fossil fuel primarily composed of methane, while coal is a solid fossil fuel formed from the remains of plants and trees that lived millions of years ago, and oil, also known as petroleum, is a liquid fossil fuel composed of hydrocarbon compounds. Natural gas is cleaner burning than coal and oil, producing fewer greenhouse gas emissions and pollutants. Coal is the most carbon-intensive fossil fuel, followed by oil and then natural gas. Additionally, coal mining can have significant environmental impacts, such as habitat destruction and water pollution, while oil extraction can lead to oil spills and habitat degradation. Natural gas is often used for electricity generation, heating, and cooking, while coal is primarily used for electricity generation and steel production, and oil is used for transportation, heating, and petrochemical production.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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