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These techniques are applied to igneous rocks, and are normally seen as giving the time since solidification.
The isotope concentrations can be measured very accurately, but isotope concentrations are not dates.
We will deal with carbon dating first and then with the other dating methods.
Carbon has unique properties that are essential for life on Earth.
A stronger magnetic field deflects more cosmic rays away from the Earth.When a “date” differs from that expected, researchers readily invent excuses for rejecting the result.