The presentation now moves on to topics of dating the earth, and the world-wide flood.

Can we rely on radiometric dating principles to prove that the earth is really very old, thereby providing the necessary time evolution requires if it is true?

The basic premise behind radiometric dating is that a parent isotope in a rock or other object containing the isotope (such as Potassium, K) decays over time into a daughter isotope (such as Argon, Ar) at a known rate (as measured in the laboratory), specified by its "half-life".

Some methods use isotopes that have a long half-life, and are therefore capable in theory of measuring long amounts of time, while others such as Carbon-14, have a relatively short half-life and can only measure recent history.