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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.Carbon-14 is also passed onto the animals that eat those plants.After death the amount of carbon-14 in the organic specimen decreases very regularly as the molecules decay. This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.The carbon cycle shows how carbon moves from the atmosphere, through various animals and plants, then back into the atmosphere again.It is passed from one organism to the next in complex molecules, and returned to the atmosphere as carbon dioxide again.Green plants and algae remove carbon dioxide from the atmosphere by When an animal eats a plant, carbon from the plant becomes part of the fats and proteins in the animal.

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A couple of flutes made from bird bone and mammoth ivory came from Hohle Fels Cave in Germany, which contains early evidence of the occupation of Europe by modern humans, or Homo sapiens.Carbon generally forms four covalent bonds with other atoms in larger molecules.Atomic number 6; atomic weight 12.011; sublimation point above 3,500°C; boiling point 4,827°C; specific gravity of amorphous carbon 1.8 to 2.1, of diamond 3.15 to 3.53, of graphite 1.9 to 2.3; valence 2, 3, 4.All cells contain carbon compounds such as proteins, fats and carbohydrates.Carbon is passed from the atmosphere, as carbon dioxide, to living things.However, the principle of carbon-14 dating applies to other isotopes as well.Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.Until this century, relative dating was the only technique for identifying the age of a truly ancient object.By examining the object's relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site.A barrage of tests proves that the marijuana possessed potent psychoactive properties and casts doubt on the theory that the ancients only grew the plant for hemp in order to make clothing, rope, and other objects. Lead author Ethan Russo told Discovery News that the marijuana "is quite similar" to what's grown today.(Source) In 2007, a 5,000-year-old piece of chewing gum, the oldest ever discovered, was found by a British archaeology student in Finland.