Earth dating wiki

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Elements exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.

A particular isotope of a particular element is called a nuclide. That is, at some point in time, an atom of such a nuclide will spontaneously change into a different nuclide by radioactive decay.

This helps to counter the effects of heating and squeezing, which a rock may experience in its long history.

Different dating methods may be needed to confirm the age of a sample.

The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. It is the main way to learn the age of rocks and other geological features, including the age of the Earth itself.

It may be used to date a wide range of natural and man-made materials.

Most of the mass concentrated in the middle and began to heat up.

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Then, about 4.68×10 years ago, the solar nebula began to contract, rotate and gain angular momentum.

This may have been triggered by a star in the region exploding as a supernova, and sending a shock wave through the solar nebula.

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