Radiometric dating moon rocks

In the early part of the 20th century, scientists still weren’t sure how old Earth is.

Nowadays, scientists use radiometric dating of various sorts of rock – both earthly and extraterrestrial – to pinpoint Earth’s age.

They consist of measuring the amount of radiometric (mother) element and comparing it to the amount of stable (daughter) element. Uranium is radioactive, which means it is in the process of changing from an unstable element into a stable one. And after 9 billion years 75% of it would be lead and 25% uranium, and so on. (an) episode of drastically accelerated decay has ... When the crystal is looked at under a microscope, these discolourations appear as dark ringshence the name "pleochroic halo".

Few people realize it but all radiometric methods required at least three assumptions. Now the magnitude of the radius of a pleochroic halo in a particular mineral depends on the amount of energy that the alpha particle has ... depends on the half-life of the particular decay responsible for this alpha particle emission.

This work gave rise to a process known as radiometric dating.

This technique is based on a comparison between the measured amount of a naturally occurring radioactive element and its decay products, assuming a constant rate of decay – known as a half-life.

He concluded that Earth was born 20 to 400 million years ago.

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There are many ways to keep track of time, the most reliable of which is to use actual records such as counting hours, days, weeks, and years.

However, when we speak of the distant past, there are no historical records and thus no verifiable way to prove that a certain 'date' is correct.

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