How is the Earths years calculated?

Answer 1

The age of the Earth is 1_E17_s(4.54 × 109 years ± 1%).Answers.comAnswers.comAnswers.comThis age is based on evidence from Radiometric_datingof Meteoritematerial and is consistent with the ages of the oldest-known terrestrial and Earth's_moonMoon_rock.

Following the Scientific_revolutionand the development of radiometric age dating, measurements of lead in uranium-rich Mineralshowed that some were in excess of a billion years old.Answers.comThe oldest such minerals analyzed to date - small crystals of Zirconfrom the Jack_Hillsof Western_Australia- are at least 4.404 billion years old.Answers.comAnswers.comAnswers.comComparing the Massand Luminosityof the Sunto the multitudes of other Star, it appears that the solar system cannot be much older than those rocks. Ca-Al-rich_inclusions(Inclusion_(mineral) rich in Calciumand Aluminium) - the oldest known solid constituents within Meteoritesthat are formed within the solar system - are 4.567 billion years old,Answers.comAnswers.comgiving an age for the solar system and an upper limit for the age of Earth. It is hypothesised that the Accretion_(astrophysics) of Earth began soon after the formation of the Ca-Al-rich inclusions and the meteorites. Because the exact accretion time of Earth is not yet known, and the predictions from different accretion models range from a few millions up to about 100 million years, the exact age of Earth is difficult to determine. It is also difficult to determine the exact age of the Oldest_rockon Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.