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rock that forms from lava from a volcanic eruption)—perhaps in the rock layers above where the fossil was found, or in the layers below.

So if scientists wanted to measure the age of a fossil using this method, they would look for a nearby layer of igneous rock (e.g.

Other scientists collected samples from cooled lava flows from Mt Ngauruhoe, in New Zealand.

These rocks are If this method doesn’t work on rocks the ages of which we know, how can we trust it to work on rocks of unknown age?

When these (and other) problems are then taken into account, a scientist can interpret the result of the carbon dating within a Biblical timeframe, but even so, these results can not be used to the age of once-living things.

Most people think that scientists can actually measure the ages of rocks, using a method called “radiometric” or “radioisotope” dating.

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