How is it that some dinosaur bones don’t decompose after millions of years? What keeps them so well preserved compared to the remains of dead animals normally?

Question

How is it that some dinosaur bones don’t decompose after millions of years? What keeps them so well preserved compared to the remains of dead animals normally?

In: 4

Answer 1

Because they aren’t bone anymore.

Dinosaur fossils are just that, fossils, and they go through a process called fossilization, specifically mineralization, where over years and years trapped underground the organics in the bone are gradually replaced by inorganic minerals.