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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