Geochronology is the science of determining the age of rocks, minerals, fossils, and other geological materials. It involves the study of the absolute and relative timing of events in Earth's history, such as the formation of rocks, tectonic processes, and the evolution of life. Geochronologists use a variety of dating techniques, such as radiometric dating, stratigraphy, and paleomagnetism, to establish the timeline of Earth's geological and biological history. This information is important for understanding past processes, predicting future events, and reconstructing the Earth's history over millions to billions of years.