Cindyc601 Cindyc601

21-02-2015
Biology

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

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AmyLee01 AmyLee01

22-02-2015

It's a fossil 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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