Based upon radiometric dating the age of the earth is
But recently the prices of these devices have dropped to levels that even amateur meteorite hunters and others can afford.Used mass spectrometers are currently available at e Bay for as little as US.He argues the few instances in which radiometric dating has produced anomalous results “may be due to laboratory errors (mistakes happen), unrecognised geologic factors (nature sometimes fools us), or misapplication of the techniques (no-one’s perfect)”.Dalrymple also notes scientists do not rely solely on the self-checking nature of radiometric dating to confirm their results.The phenomenon of radioactivity is rooted in the fundamental laws of physics and follows simple mathematical formulae, taught to all calculus students.Dating schemes based on rates of radioactivity have been refined and scrutinised over several decades, and the latest high-tech equipment permits reliable results to be obtained even with microscopic rock samples.Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (called an isochron) by means of standard linear regression methods of statistics.The slope of the line determines the age of the rock, and the closeness of fit is a measure of the statistical reliability of this conclusion.
However, because plate tectonics constantly changes and revamps the crust, the first rocks have long since been recycled, melted down and reformed into new outcrops.
Scientists also must battle an issue called the Great Unconformity, which is where sedimentary layers of rock appear to be missing (at the Grand Canyon, for example, there's 1.2 billion years of rock that can't be found).
There are multiple explanations for this uncomformity; in early 2019, one study suggested that a global ice age caused glaciers to grind into the rock, causing it to disintegrate.
They've attempted to predict the age based on changing sea levels, the time it took for Earth or the sun to cool to present temperatures, and the salinity of the ocean.
As the dating technology progressed, these methods proved unreliable; for instance, the rise and fall of the ocean was shown to be an ever-changing process rather than a gradually declining one.