4.6 billion years in the history of the planet. That's an amazingly long time. This video will help you put that into perspective.
Reviews how scientists have been able to determine the age of Earth and major events along the geologic time scale.
Bertram Boltwood first used radiometric dating to determine the ages of rocks and of Earth. Although his calculations were not completely accurate, he brought in an important new source of scientific information to the field of geology.
Discover how scientists use radiometric dating to determine the age of Earth.
Reviews how Lord Kelvin calculated Earth's age and why his result was much too young.