earth
A museum shows off the bones of a dinosaur that lived and died millions and millions of years ago.
Fossils form because minerals slowly replace the bones after they get buried under layers of mud and rock. Over thousands of years, water carrying dissolved minerals seeps into the buried bone, and bit by bit those minerals take its place, turning it into solid rock shaped exactly like the bone.
Bones don't freeze forever or turn into gold — those are just made-up ideas, not how nature actually preserves ancient remains.
Because this takes so incredibly long, finding a complete dinosaur fossil is rare — most bones simply decay away before minerals ever get the chance to replace them.
earth
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