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10 February, 22:30

What are cavities left in rocks when a shell or bone dissolves called

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  1. 11 February, 02:19
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    It's a f ossil form formed by either a mold or a cast. If an organism completely dissolves in the rock, it can leave an impression in the rock, called an external mold. If that mold gets filled with minerals, it becomes a cast.
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