Using uranium-238 scientists have discovered that the oldest rock found is 3.96 billion years old.
Scientists used that date to estimate the age of the Earth to be around 4.6 billion years old.
Thermo Luminescence (TL) Dating This method is based on the phenomenon of natural ionizing radiation inducing free electrons in a mineral that can be trapped in defects of the mineral’s crystal lattice structure.
When trapped electrons escape as TL and are heated to a temperature below incandescence, the TL of a mineral such as quartz, can be recorded.
Dendochronology This method of dating is based on the number, width, and density of annual growth rings of long-lived trees.
A master tree-ring index has been constructed in the southwestern United States for the Douglas fir and bristlecone pine.Uniformitarianism states that the processes occurring today are similar to those that occurred in the past.So if Uranium-238 is decaying at a specific rate, then scientists believe that it decayed at the same rate throughout the ages.Geologists need to use the right isotopes to determine ages, because for example fossils 1 billion years old don't have carbon left so we have to use another isotope like uranium-238 which has a half life of 4.5 billion years.This radiometric dating technique is used when dating igneous and metamorphic rock, but not sedimentary rock.Using carbon to date rocks is called radiocarbon dating and is only good up to about 50,000 years, because eventually there isn't enough carbon left to use.By measuring the amounts of parent and daughter materials in a rock and by understanding the half-life of the parent we can calculate the age of rocks.There are lots of ways to estimate ages, and geologists knew the earth was old a long time ago. God, the Father, sent His only Son to satisfy that judgment for those who believe in Him.Radiometric dating actually allows the measurement of absolute ages, so it is deadly to the argument that the earth cannot be more than 10,000 years old. Jesus, the creator and eternal Son of God, who lived a sinless life, loves us so much that He died for our sins, taking the punishment that we deserve, was buried, and rose from the dead according to the Bible.Hutton also felt that the observable Earth processes at work today on the Earth, as well as in it, would be similar to the processes in the past.Another scientist named Lyell took it a little further by dating some of the Earth processes.