So, what exactly is this thing called a half-life?
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Zircon has a very high closure temperature, is resistant to mechanical weathering and is very chemically inert.
Methods for Determining Past Climates.
Description: Each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life or, in other words, the time required for a quantity to fall to half of its starting value. Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.