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A fossil is a trace of an organism of a past geologic age such as a skeleton or a leaf imprint embedded and preserved in the Earth's crust. A fossil could be any preserved remains of anything that once lived. Paleontology is the study of fossils their age and the method of formation. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossil remnants are from around 3.48 billion years ago. There are many processes that lead to fossilization. Fossils vary in size from one tiny bacteria to entire dinosaur skeletons.
Fossil fuels are natural fuels like coal, petroleum and natural gas. Fossil fuels are formed from the remains of living organisms. Fossil fuels provide us with a source of nonrenewable energy. Fossil fuels are buried deep inside the earth for millions of years. Over time heat and pressure has turned these remains into the fossil fuels that we call coal, oil and natural gas. Fossil fuels are the result of decomposition of dead plant and animal matter.