An animal, creature or plant dies and ends up at the bottom of the sea. It gets covered in a layer of rock., Over time, more layers of rock form on top and the only thing which remains are the bones or the space where the bones used to be (mould fossils)., Sometimes sediment enters the space where the bones used to be and takes the shape of the creature (cast fossil)., Over a long period, the sea may recede / go back leaving the rock., Erosion and weathering of the rock means the fossil can now be seen!.

Rocks - Fossils

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