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QUESTION
The Earth's interior currently holds approximately 1017 kg of Uranium-238, which has a half-life of 4.5 billion years. How much was present when the
The Earth's interior currently holds approximately 1017 kg of Uranium-238, which has a half-life of 4.5 billion years. How much was present when the Earth first formed? If the Sun expands and consumes the Earth 9 billion years from now, how much U-238 will be left just before we are engulfed?
