**e.g's of radiometric dating**K^40 -> Ar^40 This is used in sedimentry and metamorphic rocks halflife= 1260ma

Uranium-238 -> lead-206 This is used to find the age of igneous rocks halflife= 4500ma

Rb^87 -> Sr^87 This is used in very old igneous rocks - very long halflife = 50,000ma

*Problems of radiometric dating*- hard to date-> they erode easily, contain different minerals, layed down different times (Diachronus) and they need the mineral glauconite.*Sedimentry*is a gas so its almost impossible to find out the age in K^40 dating*Argon*+- 15ma*There is a margin of error in the dating-*- not a closed system. when it melts the time clock resets back to zero*Matamorphic*

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