ERSC 1F90 Lecture Notes - Lecture 2: Beta Particle, James Hutton, Oceanic Crust
9 Apr 2015
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Absolute time: time in specific units: ex. If you know my birth day, you will know exactly how old i am based on how much time has passed: you can estimate absolute age based on observations. Relative time: a time relative to another time (specific units aren"t known: ex. You could estimate the relative age off three people (relative time since each was born: an estimation based on observation. The age of the earth: fundamental question that puzzled humans for thousands of yeas, archbishop ussher (1654): estimated based on biblical records earth formed in. 4004 bc: fossils folded into rock are counter-evidence. Radiometric dating: method for estimated absolute age of rocks. Isotopes: forms elements with different atomic mass: for a given element the atomic number remains the same, therefor the number of neutrons is different (eg. uranium has three common isotopes:
