Creationist view on absolute dating
Creationist view on absolute dating - youth dating lessons
Once the rock hardens, however, all the Argon-40 is trapped in the sample, giving us an accurate record of how much Potassium-40 has decayed since that time.So, if we find a rock with equal parts Potassium-40 and Argon-40, we know that half the Potassium-40 has decayed into Argon-40, and that the rock hardened 1.3 billion years ago.
Astronomers and geologists have determined that the universe and Earth are billions of years old.Radiometric dating requires that one understand the initial ratio of the two elements in a given sample by some means.In this case, Argon-40 is a gas that easily bubbles out and escapes when it is produced in molten rock.The oldest reliably dated rock formation is in Greenland, where several different isotopes were used to find an age of 3.6 billion years.To find older rocks that haven’t been eroded, we need to look beyond Earth.As time passes, a rock will have more and more Argon-40 and less and less Potassium-40.
Radiometric dating is possible because this decay occurs at a known rate, called the “half-life” of the radioactive element.
A tree’s age can be found by simply counting its rings.
By comparing the pattern of thick and thin rings to weather records, scientists can verify that the method is accurate.
It’s hard to find rocks on the surface of the Earth that have not been altered over time.
Most old rocks have been eroded by wind and water or submerged by continental plates.
These methods are largely independent of each other, based on separate observations and arguments, yet all point to a history much longer than 10,000 years.