How old is the earth radiometric dating. How Old is The Earth Really? Flashcards

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How Old Is The Earth?

how old is the earth radiometric dating

The problem with scientific attempts to estimate age is that it is rarely possible to know with any certainty that our starting assumptions are right. First, a bit of background information is in order. Any amounts chosen must be based on assumption. This is perhaps the most common objection of all. Has science therefore disproved the Bible? The assumption of a great age will influence the interpretation of the data and is certainly likely to lead to colossal misconceptions, the most outstanding of which is the widely propagated view that radiometric dating has established the age of the Earth to be 4.

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Age of the Earth

how old is the earth radiometric dating

Therefore, if the extrapolation shown in Fig. By using the radiometric dating system on these meteorites, geologists have been able to determine that the Earth is 4. According to , less than 100 meteorites have been subjected to isotope dating, and of those about 70 yield ages with low analytical error. However, it is even more surprising to learn that the lead isotope ratios chosen by Patterson et al. This is done by measuring a proxy and performing a calculation. Instead, it would be far more accurate to say that scientists attempt to estimate the age of something.


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How Old is The Earth Really? Flashcards

how old is the earth radiometric dating

However, his calculations were far more accurate than any that had been performed to that time. All the carbon-14 would be gone after one million years. The melting of the rock and releasing of any argon set the potassium-argon clock to zero. Radioactive decay occurs at a constant rate, specific to each radioactive. Because this type of decay involves a particle outside the nucleus, the decay rate may be affected by variations in the electron density near the nucleus of the atom.

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Radiometric Dating and the Age of the Earth

how old is the earth radiometric dating

Samples returned from the Apollo and Luna missions revealed ages between 4. This chord is called discordia. Decay of Radioactive potassium-40 to argon-40. The assumptions are untestable because we cannot go back millions of years to verify the findings done today in a laboratory, and we cannot go back in time to test the original conditions in which the rocks were formed. When it is up-ended, sand flows from the top container to the bottom one at a rate that can be measured. Since the initial physical state of the rock is unknowable, workers must assume it. This type of decay is electron capture e.

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How Old is The Earth Really? Flashcards

how old is the earth radiometric dating

If the sample contained this ratio, then the rock would be declared 1. Since 1955 the estimate for the age of the Earth has been based on the assumption that certain meteorite lead isotope ratios are equivalent to the primordial lead isotope ratios on Earth. Animals then eat the plants, by which c-14 is integrated into their body. In order for this kind of estimate to work, certain assumptions must be used. Atoms are made up of electrons, protons, and neutrons, and the number of electrons and protons determines the type of atom. Even when we test specimens that evolutionists believe to be millions of years old, such as coal beds, carbon-dating consistently reveals age estimates of a few thousand years.

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How Old is the Earth: Radiometric Dating

how old is the earth radiometric dating

Various chemicals, and specifically radioactive isotopes were formed together. Share This Page Did you know that you can be a Christian, and believe that the earth is billions of years old? These calculations were not particularly trustworthy. Thus the age of the oldest terrestrial rock gives a minimum for the age of Earth, assuming that no rock has been intact for longer than the Earth itself. The Moon, as another extraterrestrial body that has not undergone plate tectonics and that has no atmosphere, provides quite precise age dates from the samples returned from the Apollo missions. People often have grave misconceptions about radiometric dating. My main interest is astrobiology, so this is very useful. Hydrogen, for example, has one electron and one proton.

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How Old Is Earth?

how old is the earth radiometric dating

Samples of the meteorite show a spread from 4. This is called a model-age method. Another half-life reduces the amount to one-eighth, then one-sixteenth and so on. I would rather put my confidence in someone who asks more probing questions into the reliability of accepted standards than blindly establishing their research on the herd mindset. By doing so, they can calculate how much time has passed. A study in the 1960s showed that the decrease in the dipole component since the turn of the century had been nearly completely compensated by an increase in the strength of the nondipole components of the field. The method does work on certain minerals that retain argon well, such as muscovite, biotite, and volcanic feldspar, but not on other minerals, such as feldspar from granite rocks, because they leak their argon even at low temperatures.

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How Old Is Earth?

how old is the earth radiometric dating

Second, the rock or mineral must not lose or gain either potassium or argon from the time of its formation to the time of analysis. In other words, the Rhenium decays over 1 billion times faster under such conditions. If the wood still has relatively short-lived radiocarbon inside it, then the age of the supposedly ancient fossils would need revision. From then on, as each atom of 87Rb decays to 87Sr, the points will follow the paths shown by the arrows. To summarize: both experimental evidence and theoretical considerations preclude significant changes to rates of radioactive decay.

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