Fuel formed under the earth's surface by the decomposition of organic matter is called ___ .
Fossil fuels are the fuels formed under the earth's surface by the decomposition of organic matter.
Fuel formed under the earth's surface by the decomposition of organic matter is called ___ fuel.
What are fuels formed under the earth's surface by the decomposition of organic matter called?
Fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, is called ___ fuel.
Which of the following fuel is formed under the earth's surface by decomposition?