bn:01621614n
Noun Concept
EL
αρχέγονη ισότοπο  αρχέγονη νουκλεϊδίου  αρχέγονο στοιχείο
EN
In geochemistry, geophysics and nuclear physics, primordial nuclides, also known as primordial isotopes, are nuclides found on Earth that have existed in their current form since before Earth was formed. Wikipedia
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