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Cast: Fossil formed when a mold is later filled in by mud or mineral matter.
Amber: Transparent golden-brown resin fossil formed from hardened pine tree sap.
The soft parts of an animal or plant decay more quickly than its hard parts.
Teeth and bones are therefore more likely to be preserved than skin, tissues, and organs.
In the best conditions, fossilization will occur if an animal or plant dies and is quickly covered over with moist sediment.
This prevents the animal or plant from being eaten by other organisms or from undergoing natural decay through exposure to oxygen and bacteria.