How a dinosaur became a fossil

How a dinosaur became a fossil

1.Dinosaur lived the Earth during the Mesozoic Era, over 70 million years ago
2.After died,But they still leave some preserved remains , we can learn more about dinosaur
3.It body is exposed to a variety of factors that destroy it-scavengers, decomposers, wind and rain.
4.If their remains are quickly buries, such as in a flood, they are preserved.
5.Layers of sand and silt bury the remains under a protective covering of sediment
6.Over many years,the layer harden into sedimentary rock, with the dinosau remains trapped within
7.Over millions of years ,the remains can become fossilized . As materials within the bone are dissolved by water and replaced by minerals from the ground.
8.Geological processed, such as uplift, bring the deeply buried layers up toward the surface
9.If near the surface, some process such as wind and erosion help to expose the fossils
10.Paleontologists  excavated the fossils in order to lean more about dinosaur and their time.
11.You can find some pretty and whole fossils shows on museum or school. But the real skeleton always keep in national museum , because it is really very precious.