I could write a rather lengthy article in response, but I will try to keep things brief. Hebert’s closing declaration: This is a true statement.All truth is God’s truth, including the truths revealed in the creation.Most do not realize the scientific community is rather unified on the earth being several billion years in age.The most straightforward dating technique is emphasized in this paper – radiometric dating.
Many are completely unaware of the great number of independent, laboratory measurements that have shown these methods to be consistent.
These unstable atoms tend to "decay" into stable ones; they do this by emitting a particle or particles. The time it takes for half of a given amount of a radioactive element to decay into a stable one is what is known as the "half-life".
By matching the proportion of original unstable isotope to stable decay product, and knowing the half-life of that element, one can thus deduce the age of the rock, as shown in the following diagram.
During the 19th century, and even well into the twentieth, geological chronology was very crude.
Dates were estimated according to the supposed rate of deposition of rocks, and figures of several hundred million years were bandied out; usually arrived at through inspired guesswork rather than anything else.
Rocks are made up of many individual crystals, and each crystal is usually made up of at least several different chemical elements such as iron, magnesium, and silicon.