For a dead animal to become fossile it need to be buried quickly.By falling into muddy water bed or by strom etc.
The soft tissue of the animal rots away but the skeleton remains and turn into rocks after millions of years
Over time the mud and river sediments build up over the fossils and form into sedimentary rocks
Because of erosion and movements in the Earth's crust can expose it.A Palaeontologist can find it easily
PALAEONTOLOGIST - a person who study about rocks,fossils and prehistory
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