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Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history. After all, the ever-changing Earth rarely left a complete geological record. Further Reading: It's Elemental In this interactive periodic table, explore the elements and their properties and abundances. University of California Press. Carbon has three natural isotopes: What is the most common form of carbon?

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Bowman, Sheridan. For his work on carbon dating, Libby received the Nobel Prize in chemistry in It is radioactive and decays over time. Before then, the Bible had provided the only estimate for the age of the world: It turns out the answers are in Earth's rocks.

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Further Reading:

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Radiocarbon Dating

See if you can build a cathedral arch without it collapsing, and learn more about the forces at work. In American chemist Willard Libby figured that plants would absorb some of this trace carbon while they absorbed ordinary carbon in photosynthesis. Unlike the other natural isotopes of carbon, carbon is unstable. The C method cannot be used on material more than about 50, years old because of this short half-life. Deciphering the Disciplines The archaeology family tree. That process is called radioactive decay.

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Radioactive Decay of Carbon-14

Consider carbon, the backbone of life. In American chemist Willard Libby figured that plants would absorb some of this trace carbon while they absorbed ordinary carbon in photosynthesis. Since then, the remains of those trees have been well preserved by the arid climate. Max Tegmark on Time Physicist Max Tegmark says that time is still one of the biggest mysteries in physics. And about one in a million have eight neutrons. Laser Ablation How teeth can tell the time.

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