The half-life of potassium-40 is 1,310 million years, after which half of its substance will have changed into stable argon-40. When the magnetic north pole is close to the geographic north pole as it is today , it is called normal polarity. This content is currently under construction.
Relative dating and absolute dating Dating Fossils – How Are Fossils Dated? how do we know how old a fossil is? There are two main methods.
Difference Between Relative and Absolute Dating
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