It is called a mold fossil, which can become a cast fossil. After the soft parts of the animal rot away, a cavity remains (the mold fossil) which becomes filled with hardened sand or mud (the cast fossil).
yes it does when the fossil goes into the ground, but not always like when it rains the fossil does not go in the ground fully.
This is called a mold, a mold is when a fossil has a cavity in a rock, it turns into a fossil when it becomes a cast, so technically yes it is a fossil
cast
It is a cast fossil.
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when fossile mould is filled it forms the model of the fossile
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it is a fossil copy of an organism filled withsediment or mineral deposits.