Final answer:
Coal and natural gas are two fossil fuels used for energy production. Coal is a black sedimentary rock made of carbon, while natural gas is a colorless and odorless gas primarily composed of methane.
Step-by-step explanation:
Coal and natural gas are two fossil fuels that are commonly used for energy production. Coal is a black, sedimentary rock that is primarily composed of carbon, along with various other elements such as hydrogen, sulfur, and oxygen. It is formed from the remains of plants that lived and died millions of years ago. Natural gas, on the other hand, is a colorless and odorless gas that is primarily composed of methane. It is formed deep beneath the Earth's surface from the remains of ancient marine organisms.
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