Radioactive decay and absolute dating

There are two main methods determining a fossils age, relative dating and absolute dating.

Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.

He calculated the modern rate of salt delivery to the oceans, and suggested that the present salinity of ocean water would take at least 100 million years to develop.

In the 1860's, English physicist Lord Kelvin disagreed with Charles Lyells proposition that the earth behaves in a uniform, unchanging manner.

This technique relies on the property of half-life.

Half-life is defined as the time it takes for one-half of a radioactive element to decay into a daughter isotope.

Mountains, erosion, and variations in climate were considered to be punishment for the sins committed by humanity.

Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.Index fossils are fossils that are known to only occur within a very specific age range.Using relative dating the fossil is compared to something for which an age is already known.For example if you have a fossil trilobite and it was found in the Wheeler Formation.

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