Carbonaceous films

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The tissue of most orgamisms are made of compounds that contain carbon. Sometimes, the ony fossil remains of dead plant or animal is this carbon. Fossils usually form when a dead organism is buried in sediments. As more and more sediments pile up, the organism is subjected to pressure and heat. These conditions force gases and liquids from the body. A thin film of carbon residue is left, forming an outline of the original organism, resulting in a type of fossil called a CARBONACEOUS FILM. The process of chemically changing organic material is called CARBONIZATION.

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