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{titulo}What fossils are.
 

Fossils are remains of organisms or activity track of organisms which lived in remote times.When alive beings die, the soft parts rot fastly, and the hard ones dessapear in more or less time. This is the normal process.
Nevertheles, if the being is fastly covered by sediments which have suitable physicochemical properties, those sediments prevent the oxigen providing, avoid the mechanical destruction and stop the rotting.
The solid shells and skeletons use then to remain, while the soft parts are integrated in the sediments and they get the modification that transform them in stone.
When the organic material rots, the hard parts become porouses and allow the mineral solutions, which flow in the stone, to pass through.

The most frequent fossilizations are in calcium carbonate, calcium phosphate, silica, pyrites, marsh ore, hematite, amber, etc...
Vegetables and chitinous shells normaly appear carbonized, because if there is not oxigen, cellulose transforms in carbonic gas and methane, that use to leave, remaining only the carbon.

 
 

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