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Carbon is also found in many compounds including carbon dioxide in the Earth's atmosphere and dissolved in the oceans and other major bodies of water. It is used for fuel in the form of coal, methane gas, and crude oil (which is used to make gasoline).
Carbon dating only works for fossils that are less than 60,000 years old, so carbon dating won't work if you find a dinosaur bone because dinosaurs lived on Earth millions of years ago.
One of the key characteristics of carbon is its ability to make long chains of molecules through linking up with other carbon atoms. It is a major element in many rock formations such as limestone and marble.
Carbon also has the highest melting point of all the elements. It is found in its allotropic forms of diamond, graphite, and amorphous carbon throughout the world. Carbon is used in some way in most every industry in the world.
Scientists know how fast carbon-14 decays, so by measuring how much of it is remaining in a dead organism, they can figure out how long it has been dead.
When scientists chipped the Iceman out of the block of ice he was found in, they tested his body to see how many carbon-14 atoms were remaining, which told them his age.