Do all rocks contain fossils? describe the conditions necessary for fossils to form.

No, all rocks do not contain fossil. Fossils are shaped when the body of a living being that has passed on is secured and shielded from rot by microorganisms and assaults by predators. Generally, fossils are framed when a layer of residue covers dead plants, creatures, and microorganisms. This makes sedimentary rocks like limestone and shale the best in the development of fossils.  

Volcanic rocks are shaped straightforwardly from hot magma and would not have the option to save any leftovers of living beings that fall in it during its development. Metamorphic additionally experience a ton of progress under extraordinary conditions which make the opportunity of presence of fossils present in them doubtful.

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