First Sentence:
Scientists have sought ways and means of determining the numerical age of the Earth and its constituent rocks since the study of geology along modern scientific lines began more than two centuries ago.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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radiogenic argon loss, flat age spectra, radiogemc argon, step heating results, argon retentivity, diffusion domain sizes, high apparent ages, fluence monitor, step heating experiments, flat age spectrum, given irradiation facility, cadmium shielding, age spectrum method, total fusion ages, isochron analysis, thermal history information, excess argon, age spectrum analysis, low apparent ages, step heating approach, step heating data, argon composition, argon extracted, biotite separated, monotonic cooling
Key Phrases - Capitalized Phrases (CAPs):
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Turkana Basin, Koobi Fora, Fish Canyon Tuff, Benson Mines, Fick's Second Law, After Harrison, After Lovera, Lake Turkana, New Zealand, Mare Tranquillitatis, New Mexico, Australian National University, Broken Hill, Duluth Gabbro, After Turner, Grenville Turner, Nachukui Formation, Renbu Zedong Thrust, Separation Point Batholith, Sesia Zone, Elsevier Science, Giants Range Granite, Haliburton Highlands, Late Permian, Morutot Tuff
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