How is a fossil cast or mould formed?
A) Silica fills in all open spaces in the original organic structure.
B) Soft mud surrounds a broken dinosaur bone and hardens to a mudstone cast.
C) An impression of the organism is formed by a thin film of carbon.
D) A mineral such as quartz , calcite, pyrite, or apatite is precipitated in the space left by dissolution of an original shell or other hard part.
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