This is a fossil that is a copy of an organism's structure, formed when minerals seep into a mold in sediment.

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asked Dec 19, 2018 10.1k views

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Jsdw · Answer 1 · 2018-12-25T06:22:28+0000

A cast is a fossil that is a copy of an organism's structure or shape, formed when minerals seep into a mold. The mold and the cast preserve the details of the animal's structure. Mold is formed when a hard part of an organism is buried in a sediment. One good association to this is molds of shells.

This is a fossil that is a copy of an organism's structure, formed when minerals seep into a mold in sediment.

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