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    Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known as "bracketing" the age of the sedimentary layer in which the fossils occur.

    It is founded on unprovable assumptions such as 1) there has been no contamination and 2) the decay rate has remained constant.

    There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

    It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.

    Measuring the uranium-to-lead ratios in the oldest rocks on Earth gave scientists an estimated age of the planet of 4.6 billion years.

    Segment from A Science Odyssey: "Origins."Geologists have calculated the age of Earth at 4.6 billion years.

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