describe fossils in 500 words.....
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Fossils are specimens of organism in the rocks or in the layers of the soil.
Fossils are made in thousand of year by pressure and heat of earth.
Step1.The organism died an mix with soil.
Step2.The layers of soil starts depositing on the dead organism.
Step3.Due to the pressure of soil layers its turns into fossil.
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Fossils are made in thousand of year by pressure and heat of earth.
Step1.The organism died an mix with soil.
Step2.The layers of soil starts depositing on the dead organism.
Step3.Due to the pressure of soil layers its turns into fossil.
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Hope you are satisfied......:)♡♡♡♡♡♡
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hey frnd...here is ur ans is...☺☺
Fossils can be divided into two categories, fossilized body parts (bones, claws, teeth, skin, embryos, etc.) and fossilized traces, called ichnofossils (which are footprints, nests, dung, toothmarks, etc.), that record the movements and behaviors of the dinosaurs.
The four types of fossils are:
● mold fossils (a fossilized impression made in the substrate - a negative image of the organism) ●cast fossils (formed when a mold is filled in)●trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)●true form fossils (fossils of the actual animal or animal part).There are six ways that organisms can turn into fossils, including:
●unaltered preservation (like insects or plant parts trapped in amber, a hardened form of tree sap)●permineralization=petrification (in which rock-like minerals seep in slowly and replace the original organic tissues with silica, calcite or pyrite, forming a rock-like fossil - can preserve hard and soft parts - most bone and wood fossils are permineralized)●replacement (An organism's hard parts dissolve and are replaced by other minerals, like calcite, silica, pyrite, or iron)●carbonization=coalification (in which only the carbon remains in the specimen - other elements, like hydrogen, oxygen, and nitrogen are removed)●recrystalization (hard parts either revert to more stable minerals or small crystals turn into larger crystals)●authigenic preservation (molds and casts of organisms that have been destroyed or dissolved).
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Fossils can be divided into two categories, fossilized body parts (bones, claws, teeth, skin, embryos, etc.) and fossilized traces, called ichnofossils (which are footprints, nests, dung, toothmarks, etc.), that record the movements and behaviors of the dinosaurs.
The four types of fossils are:
● mold fossils (a fossilized impression made in the substrate - a negative image of the organism) ●cast fossils (formed when a mold is filled in)●trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)●true form fossils (fossils of the actual animal or animal part).There are six ways that organisms can turn into fossils, including:
●unaltered preservation (like insects or plant parts trapped in amber, a hardened form of tree sap)●permineralization=petrification (in which rock-like minerals seep in slowly and replace the original organic tissues with silica, calcite or pyrite, forming a rock-like fossil - can preserve hard and soft parts - most bone and wood fossils are permineralized)●replacement (An organism's hard parts dissolve and are replaced by other minerals, like calcite, silica, pyrite, or iron)●carbonization=coalification (in which only the carbon remains in the specimen - other elements, like hydrogen, oxygen, and nitrogen are removed)●recrystalization (hard parts either revert to more stable minerals or small crystals turn into larger crystals)●authigenic preservation (molds and casts of organisms that have been destroyed or dissolved).
hope it's help!!
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