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Petrified wood is when the tree is in contact with elements and minerals that solidify it into a rock or petrified tree. A mold is the fossilized imprint from an animal or plant organism, whilst a cast is when the organism died or ended up in a rock/mineral and ended up being filled with the minerals of the surroundings over time (from the limestone as example). This creates a replica of the organism once the actual organism dissolves.

This is what I gathered from science class today...

So I suggest you do more research if needed.

Forgive me if I'm wrong.

Good luck with whatever you need this for

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