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You wanted to determine the age of zircons that fell on Earth as meteorites. You wanted to use the 238U-206 Pb method (half-life value = 4.5 billion years). The lab results showed 25% 238U and 75% 206 Pb. Which of the following conclusions can you make about the age of zircons and the reliability of the technique? The zircons, having ages twice as much as our planet's, must have come from outside of our solar system. The lab results are not reliable because it is impossible to get 25% of the parent, 238U and 75% of the daughter, 206Pb. The ages of the zircons represent that of our Earth's (4.5 billion years) and must have come from within our solar system. The results are not reliable because 238U and 75% 206Pb is not the best method to determine ages of zircons. The age of the zircons is 1.5 billion years, nearly 1/3 that of our planet's. These zircons must have come from a different planet within our solar system.

You wanted to determine the age of zircons that fell on Earth as meteorites. You wanted to use the 238U-206 Pb method (half-life value = 4.5 billion years). The lab results showed 25% 238U and 75% 206 Pb. Which of the following conclusions can you make about the age of zircons and the reliability of the technique? The zircons, having ages twice as much as our planet's, must have come from outside of our solar system. The lab results are not reliable because it is impossible to get 25% of the parent, 238U and 75% of the daughter, 206Pb. The ages of the zircons represent that of our Earth's (4.5 billion years) and must have come from within our solar system. The results are not reliable because 238U and 75% 206Pb is not the best method to determine ages of zircons. The age of the zircons is 1.5 billion years, nearly 1/3 that of our planet's. These zircons must have come from a different planet within our solar system.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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You wanted to determine the age of zircons that fell on Earth as meteorites. You wanted to use the 238U-206 Pb method (half-life value = 4.5 billion years). The lab results showed 25% 238U and 75% 206 Pb. Which of the following conclusions can you make about the age of zircons and the reliability of the technique? The zircons, having ages twice as much as our planet's, must have come from outside of our solar system. The lab results are not reliable because it is impossible to get 25% of the parent, 238U and 75% of the daughter, 206Pb. The ages of the zircons represent that of our Earth's (4.5 billion years) and must have come from within our solar system. The results are not reliable because 238U and 75% 206Pb is not the best method to determine ages of zircons. The age of the zircons is 1.5 billion years, nearly 1/3 that of our planet's. These zircons must have come from a different planet within our solar system.
Transcribed Image Text:You wanted to determine the age of zircons that fell on Earth as meteorites. You wanted to use the 238U-206 Pb method (half-life value = 4.5 billion years). The lab results showed 25% 238U and 75% 206 Pb. Which of the following conclusions can you make about the age of zircons and the reliability of the technique? The zircons, having ages twice as much as our planet's, must have come from outside of our solar system. The lab results are not reliable because it is impossible to get 25% of the parent, 238U and 75% of the daughter, 206Pb. The ages of the zircons represent that of our Earth's (4.5 billion years) and must have come from within our solar system. The results are not reliable because 238U and 75% 206Pb is not the best method to determine ages of zircons. The age of the zircons is 1.5 billion years, nearly 1/3 that of our planet's. These zircons must have come from a different planet within our solar system.
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