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Where can they find a clock to measure these huge time periods?
Or on a slightly smaller scale, where can paleontologists find a clock to tell the age of fossils, or how can archeologists determine how old ancient pottery and buried artifacts are? They are mostly empty space with a denser tiny area called the nucleus and a cloud of electrons surrounding the nucleus.
Geologists use those radioactive isotopes to date volcanic ash or granite formations like the giant Half Dome in Yosemite National Park.
Yes, radioactive isotopes present in rocks and other ancient material decay atom by atom at a steady rate, much as clocks tick time away.
Anthropologists, archeologists, and paleontologists also use radioactive isotopes to date mummies, pottery, and dinosaur fossils. It is no more complicated than playing a dice game! Roll the Dice & Use Radiometric Dating to Find Out.