He speculated that geologic columns would have the most, Ask an Expert

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Q. John Phillips, in 1860, used the idea of sedimentation to estimation the earth's age. Based on the rate of sedimentation he observed occurring today, he assumed that around one foot of land eroded into the ocean every 1,330 years. He speculated that geologic columns would have the most height of 72,000 feet. Using his approach and numbers, compute the approximate age of the earth he came to.

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