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But after the rock solidifies, any potassium-40 that is present continues to decay, and the argon-40 that is produced cannot escape from the rock.

Thus, geologists use potassium-argon dating to measure the age of volcanic rocks.

The useful fact about these two substances is that at normal temperatures, potassium is a solid, but argon is a gas.

Therefore, during volcanic eruptions, any argon that is present escapes from the rock.

During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved.

In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.

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Time since recrystallization is calculated by measuring the ratio of the amount of The quickly cooled lavas that make nearly ideal samples for K–Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron.The ages assigned to these fossils have been obtained through radiometric dating of volcanic rocks interbedded with the fossiliferous sediments.Such numerical calibrations are crucial to understanding rates and timing of evolutionary change.We wouldn''t be dating the artifact – we'd be dating the rock and the rock might have formed millions of years earlier.Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.

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