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Casting requires that you apply a substance to a solid object in order to duplicate a shape. =) hi! Molding requires that you manipulate a substance so that you are literally creating a shape

Molds are formed as empty spaces left in a rock when the soft parts of the organism decay and the hard parts are dissolved by chemicals. The mold takes the same shape as the organism.

Cast, also known as filled-in molds, are formed when the mold is filled in another material forming a cast that has the same shape as the original organism.

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