An animal dies. Some parts of the body decay, and usually, only the skeleton is left., The skeleton is covered with sand, earth, rock, or seabed before the bones can disappear., Over a very long time, the bones break down and leave a space in the earth, like an empty mold, Minerals slowly fill the space in layers, in the exact shape of the bones., Under lots of pressure, the new minerals harden into rock., The earth is eroded away by the weather or the sea. The rock fossil is exposed and discovered.

Fossil Sequence

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