Which factors determine the type of fossil fuel formed from organic matter?

Which factors determine the type of fossil fuel formed from organic matter?

• A. The type of organic matter, the temperature and pressure, and burial time
• B. The color of the sediment
• C. The altitude of the region
• D. The amount of sunlight

Answer: (A)

Fossil-fuel types depend on the original organic material and the heat, pressure, and time those materials are buried underground. The kind of plant or other organisms that make up the material sets up what can eventually be formed. Under higher heat and pressure, and with longer burial time, that material undergoes chemical changes that concentrate carbon and other elements into coal, oil, or natural gas. Typically, abundant plant material that’s buried and subjected to strong pressure over long periods tends toward coal, while older, more fine organic matter exposed to moderate heat and pressure over time tends to form oil and natural gas. Burial time is important because the longer the material sits underground, the more fully it can mature into these fuels. Why the other factors don’t determine the outcome: sediment color is just a surface feature and doesn’t drive the chemical processes that transform organic matter. Altitude affects surface climate but doesn’t change the deep burial conditions that govern maturation. Sunlight powers the original formation of organic matter, but it doesn’t control the underground heating and compression that create fossil fuels.

Fossil-fuel types depend on the original organic material and the heat, pressure, and time those materials are buried underground. The kind of plant or other organisms that make up the material sets up what can eventually be formed. Under higher heat and pressure, and with longer burial time, that material undergoes chemical changes that concentrate carbon and other elements into coal, oil, or natural gas. Typically, abundant plant material that’s buried and subjected to strong pressure over long periods tends toward coal, while older, more fine organic matter exposed to moderate heat and pressure over time tends to form oil and natural gas. Burial time is important because the longer the material sits underground, the more fully it can mature into these fuels.

Why the other factors don’t determine the outcome: sediment color is just a surface feature and doesn’t drive the chemical processes that transform organic matter. Altitude affects surface climate but doesn’t change the deep burial conditions that govern maturation. Sunlight powers the original formation of organic matter, but it doesn’t control the underground heating and compression that create fossil fuels.