![]() ![]() Current estimate of Age of the earth is based on several dating methods used on multiple objects in the solar system which are thought to be created at the same time as earth. Today, the age of the earth is thought to be between 4.5 and 4.6 billion years, although the oldest minerals are about 4.1 to 4.2 billion years old. In 1907, Bertrum Boltwood calculated the age of a uranium rich mineral to be 1.64 billion years. Introduction To The World's Oceans 10th Edition Pdf Download Radioactivity had been discovered by Henri Becquerel in 1896 and using it, rocks and minerals could be dated accurately. At 1899, Earth’s age was estimated at 90-100 million years by John Joly on the basis of the sate addition rate to the oceans by rivers. In 1897, Lord Kelvin, an English physicist calculated the time that would be required for the earth to cool from a molten state and his estimate was between 20 million and 40 million years.
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