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Living things tend to ingest materials that contain carbon, so the percentage of carbon-14 within living things is the same as the percentage of carbon-14 in the environment.

Once an organism dies, it no longer ingests much of anything.

Inscriptions, distinctive markings, and historical documents can all offer clues to an artifact's age.

And if the artifact is organic—like wood or bone—researchers can turn to a method called radiocarbon dating.

In many foreign languages the words for carbon, coal and charcoal are synonyms. The carbon atoms in it make rings, which are on top of each other and slide very easily. When an object stops taking in carbon, the carbon-14 amount goes down.

Carbon in nature is found in three forms called allotropes: diamond, graphite, and fullerenes. Because the half-life (how long it takes for half of a radioactive isotope to go away) of carbon-14 is 5730 years, It is also a key part of many biological molecules (molecules used in life). Graphite is in many (typically desert) areas, including Sri Lanka, Madagascar, and Russia.

All artificially produced graphite is of the alpha type.

In addition to its use as a lubricant, graphite, in a form known as coke, is used in large amounts in the production of steel.

Each carbon atom can form four single covalent bonds.

History and Uses: Carbon, the sixth most abundant element in the universe, has been known since ancient times.

Amorphous carbon is formed when a material containing carbon is burned without enough oxygen for it to burn completely.

These small diamonds are made by squeezing graphite under high temperatures and pressures for several days or weeks and are primarily used to make things like diamond tipped saw blades.

Although they posses very different physical properties, graphite and diamond differ only in their crystal structure.