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...igneous activity (both extrusive and intrusive) occurred in the Caledonian mountain belt, which stretched from New England, Nova Scotia, Newfoundland, Scotland, and Scandinavia to eastern Greenland.

Radiometric dating of granitic intrusions associated with the Caledonian orogeny yields ages between about 430 million and 380 million years.

Add that lunar rocks record not only the Moon's tumultuous past, but Earth's early and turbulent history.

Since there no 4.5-billion-year-old Earth rocks have ever been found to show us that history, we can learn about those impacts from the Moon.

Clarify that they might have heard of radiometric dating using the element carbon-14 (carbon dating), but carbon is only one of the elements scientists can use to determine the age of a substance.

Carbon dating is useful for determining the ages of relatively young materials — up to about 50,000 years old.

If the results are accurate, it means the giant impact that created the Moon must have occurred fairly early on in the Solar System’s history.In 1905, shortly after the discovery of radioactivity, the American chemist Bertram Boltwood suggested that lead is one of the disintegration products of uranium, in which case the older a uranium-bearing mineral the greater should be its proportional part of lead.Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase...So knowing the Moon’s age gives us a good idea of when the Earth started to become a suitable place to live., involved breaking down the chemical components of a mineral within the lunar samples called zircon, according to lead study author Mélanie Barboni.

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