How Is a Fossil Cast or Mould Formed

question 198

Multiple Choice

How is a fossil cast or mould formed?

• A)An impression of the organism is formed by a thin film of carbon.
• B)Silica fills in all open spaces in the original organic structure.
• C)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.
• D)Soft mud surrounds a broken dinosaur bone and hardens to a mudstone cast.

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