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29-Jul-2016 21:28

Accordingly, carbon dating carefully applied to items from historical times can be useful.However, even with such historical calibration, archaeologists do not regard C produced and therefore dating the system.And so it's kind of a record of the atmosphere up to 10,000 years. Those are the speleothems that are coming from the top of the cave.If you want to go even further back, you can look at cave deposits, and the fancy word for these cave deposits are speleothems. But the reason why these are useful is these are formed by calcium carbonate, so they have carbon in them, and slowly over, really, tens of thousands of years, the water in the cave deposits that calcium carbonate.The amount of cosmic rays reaching the Earth varies with the sun's activity, and with the Earth's passage through magnetic clouds as the solar system travels around the Milky Way galaxy.The strength of the Earth's magnetic field affects the amount of cosmic rays entering the atmosphere.The rate of decay of N in 5,730 years (plus or minus 40 years).This is the “half-life.” So, in two half-lives, or 11,460 years, only one-quarter of that in living organisms at present, then it has a theoretical age of 11,460 years.

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But anyway, hopefully that rests some of your worries about the assumption that I made in the last video about carbon-14 being relatively constant.

Carbon has unique properties that are essential for life on Earth.

Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.

So this gives us a good record of carbon-14 in the atmosphere, assuming that it's fairly uniform throughout the atmosphere, and all evidence suggests that, and that that uniformity through the atmosphere also goes into the water supply, and into living plants and animals.

Now, the other thing, and I looked into this a little bit, it actually turns out because we are spewing so much fossil fuel right now, we are changing the amount, or the proportion of carbon-14 much, much faster than has happened in other time periods.

But anyway, hopefully that rests some of your worries about the assumption that I made in the last video about carbon-14 being relatively constant.Carbon has unique properties that are essential for life on Earth.Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.So this gives us a good record of carbon-14 in the atmosphere, assuming that it's fairly uniform throughout the atmosphere, and all evidence suggests that, and that that uniformity through the atmosphere also goes into the water supply, and into living plants and animals.Now, the other thing, and I looked into this a little bit, it actually turns out because we are spewing so much fossil fuel right now, we are changing the amount, or the proportion of carbon-14 much, much faster than has happened in other time periods.Furthermore, different types of plants discriminate differently.