Radioactive dating age of earth
Radioactive dating age of earth - Asian free chat web cybersex
These rates are usually expressed as the isotope's half-life--that is, the time it takes for one-half of the parent isotopes to decay.After one half-life, 50 percent of the original parents remains; after two, only 25 percent remains, and so on.
A breakthrough came with the discovery of radioactivity at the beginning of the 1900s.Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history.After all, the ever-changing Earth rarely left a complete geological record.As magma cools, radioactive parent isotopes are separated from previously formed daughter isotopes by the crystallization process.Ideally, the mineral crystals in igneous rocks form a closed system--nothing leaves or enters the crystal once it is formed.Some radioactive parent isotopes decay almost instantaneously into their stable daughter isotopes; others take billions of years.
The rates of decay of various radioactive isotopes have been accurately measured in the laboratory and have been shown to be constant, even in extreme temperatures and pressures.
Using this technique, called radiometric dating, scientists are able to "see" back in time.
Scientists determined the Earth's age using a technique called radiometric dating.
At time 1, 50% of the parent atoms remain; at time 2, only 25% remain, and so on.
Radiometric dating works best on igneous rocks, which are formed from the cooling of molten rock, or magma.
Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.