Radiometric dating parent to daughter ratios online dating loads of profile views
Calculate the age of the rock from the slope of the line.
The half-life of rubidium-87 is 48.8 billion years.
Ideally, the mineral crystals in igneous rocks form a closed system--nothing leaves or enters the crystal once it is formed.
Many elements have naturally occurring isotopes, varieties of the element that have different numbers of neutrons in the nucleus.
After one half-life, 50 percent of the original parents remains; after two, only 25 percent remains, and so on.
Decay curve of a radioactive element with a half-life equal to one time unit.
Once scientists have determined the parent-daughter ratio, they can use this measurement along with half-life of the parent to calculate the age of a rock containing the radioactive isotope.
Radiometric dating has shown that very old rocks--3.5 billion years or older--occur on all the continents.
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One line of evidence involves rocks from outside the Earth--meteorites and moon rocks.