Organisms die., The remains are quickly buried, usually by sand, volcanic ash or mud., The soft parts of the organism decay. Hard parts, such as bones, are left behind., Layers of sediment build up. The pressure from the layers above causes sedimentary rock to form., Water seeps into the hard remains and dissolves them. Minerals from the water are left behind. These form the fossil., Over time, the rock rises to the surface. Erosion slowly wears away the top layers of rock to eventually expose the fossil..

Fossil formation with words

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