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==Key Stage 4==
===Meaning===
[[Fossil]]s arethe remains of a dead [[organism]]s that became trapped in [[sedimentary]] rock and turned into rock themselves over millions of years. ===About Fossils===: Most [[animal]] [[fossil]]s come from the [[bone]]s, [[teeth]] and [[shell]]s of [[animal]]s which have been trapped under layers of [[sedimentary]] [[rock]]. While there the biological material has been gradually replaced by [[mineral]]s turning it into [[rock]] over millions of years.: Some [[fossil]]s are made when [[organism]]s become trapped in an [[anoxic]] environment where they cannot [[decay]] such as within [[amber]], [[Tar Pit|tar pits]] or under layers of [[ice]]. ===Foss