How are dates measured?
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Radiocarbon dating takes us back much further.
A radioactive form of carbon decays at a very slow rate, which can be measured exactly. By measuring the amount of carbon-12 and carbon-14 in a small piece of organic material, objects as old as 50,000 years ago can be dated.
Buried objects are often dated by looking at, and dating, nearby objects buried at the same time.
Ancient Egyptian hieroglyphic writing had long been indecipherable. The discovery of the Rosetta stone provided the key to understanding the ancient Egyptian script.
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Date Added: 03 January '12
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