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In contrast, Earth’s most abundant lava rocks, which represent the mantle and make up the major oceanic ridges, have values between 0.703 and 0.705.

This amount is a percentage of the original parent amount. Parent Decay and Daughter Growth Curves The half-life of U-235 decaying to Pb-207 is 713 million years.Rubidium substitutes for potassium within the lattice of minerals at a rate proportional to its concentration within the melt.Parent Decay and Daughter Growth Curves Radiocarbon Dating Dating Rocks with the Rb-Sr "Isochron" Method Getting a Rock Sample Ready for the Mass Spectrometer A Mass Spectrometer is used to Measure Isotopic Ratios A numerical (or "absolute") age is a specific number of years, like 150 million years ago.A relative age simply states whether one rock formation is older or younger than another formation.The Geologic Time Scale was originally laid out using relative dating principles.

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