The Potassium-Argon Method is a radiometric dating technique used to determine the age of rocks and minerals. It relies on the radioactive decay of potassium-40 (K-40) into argon-40 (Ar-40). Since K-40 has a half-life of about 1.25 billion years, this method is particularly useful for dating ancient geological formations. In this process, scientists measure the ratio of K-40 to Ar-40 in a sample. When a rock forms, it contains K-40, but any Ar-40 produced from decay escapes. Over time, as K-40 decays, Ar-40 accumulates, allowing researchers to calculate the time elapsed since the rock solidified.