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Naturally Occurring Radioactive material, natural materials contain radioactive elements (radionuclides), known as NORM. The earth's crust is radioactive. Information
G. Brent Dalrymple's classic debunking of the young-earth 'scientific' creationism's dating methods with a short explanation of how geologists know the age of the earth
The history of technology, history of science, history of inventions, the scientific revolution, the industrial revolution, the internet, space, communications
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Isotope: Half-life (years) Found in nature? Isotope: Half-life (years) Found in nature? In-115: 4.41 x 10 14: yes: Gd-152: 1.08 x 10 14: yes: Ba-130: 7.00 x 10 13
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Interweaving the relative time scale with the atomic time scale poses certain problems because only certain types of rocks, chiefly the igneous variety, can be dated
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