EVERYDAY SCIENCE

Detailed explanation-1: -The three primary methods are: Radiation Measurement. Stratigraphic Superposition. The Fossil Record.

Detailed explanation-2: -The ages of Earth and Moon rocks and of meteorites are measured by the decay of long-lived radioactive isotopes of elements that occur naturally in rocks and minerals and that decay with half lives of 700 million to more than 100 billion years to stable isotopes of other elements.

Detailed explanation-3: -Thermal ionization mass spectrometer used in radiometric dating. To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay.

Detailed explanation-4: -Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.