There are many different ways that fossilisation occurs, but it only takes place in ____ rock. Firstly, the animal dies either on ____ or in the sea and gets covered by a layer of material such as soil.Over time, the material compacts down and forms a layer of ____ . The soft parts of the animal like its ____ will decompose and only the hard parts such as bones and ____ will remain. Over thousands of years, even the bones will decompose, leaving a ____ (like a mold) in the ground. Sediment enters this space, and replaces where the shape of the animal once was. As the ____ starts to recede in certain places, and the wind blows away debris, the fossil starts to move ____ to the surface. Eventually, the ____ become exposed and can be discovered.

Fossils

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