What is the difference between radioactive decay and radiometric dating

It stated that this is possible because each event melted part of it, and thus the atomic clock of that part was reset.

Droughts and other variations in the climate make the tree grow slower or faster than normal, which shows up in the widths of the tree rings.In the liquid or gaseous state, however, particles can move around and boil off.Because of radioactive decay, the material starts out with a larger amount of daughter isotope than is chemically favorable, so some of it will escape to bring the material to equilibrium.The resulting layers, called varves, give scientists clues about past climate conditions.For example, an especially warm summer might result in a very thick layer of sediment deposited from the melting glacier.