Example of absolute dating geology

Uranium's atomic number is 92, corresponding to its number of protons.

But Google didn't invent this number; instead, human ingenuity and applied physics have provided it.Uranium-lead (U-Pb) dating: Radioactive uranium comes in two forms, uranium-238 and uranium-235.The number refers to the number of protons plus neutrons.Rubidium-strontium (Rb-Sr) dating: Radioactive rubidium-87 decays into strontium-87 with a half -life of 48.8 billion years.Not surprisingly, Ru-Sr dating is used to date very old rocks (as old as the Earth, in fact, since the Earth is "only" around 4.6 billion years old).

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