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Since the early twentieth century scientists have found ways to accurately measure geological time. The discovery of radioactivity in uranium by the French physicist, Henri Becquerelin paved the way of measuring absolute time. Shortly after Becquerel's find, Marie Curiea French chemist, isolated another highly radioactive element, radium.

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U and Th are found on the extremely heavy end of the Periodic Table of Elements.

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Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.

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