Absolute dating ppt
In the field of Geology, dating is an important term as it is a technique through which evaluation regarding the age and period about the fossil, remains, the archaeologists do valuables and artifacts.
At first, there were not many methods of dating were available, but now with advancement in the technology, we mainly have two types of techniques to ascertain ages of ancient belongings.
These use radioactive minerals in rocks as geological clocks.
The atoms of some chemical elements have different forms, called isotopes.
The absolute dating is more reliable than the relative dating, which merely puts the different events in the time order and explains one using the other.
Radiometric dating is another crucial technique through which the exact age can be obtained.
Relative dating is a less advanced technique as compared to absolute dating.
In other words, we can say that the age in relative dating is ascertained by witnessing the layers of deposition or the rocks.Because of their unique decay rates, different elements are used for dating different age ranges.For example, the decay of potassium-40 to argon-40 is used to date rocks older than 20,000 years, and the decay of uranium-238 to lead-206 is used for rocks older than 1 million years.Geologists use radiocarbon to date such materials as wood and pollen trapped in sediment, which indicates the date of the sediment itself.The table below shows characteristics of some common radiometric dating methods.
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In radiometric dating, the radioactive minerals within the rocks are used to know about the age of the object or the sites.
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