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This damage is in the form of tiny marks called fission tracks.

When volcanic rocks and minerals are formed, they do not contain fission tracks.

This form of uranium usually decays into a stable lead isotope but the uranium atoms can also split – a process known as fission.

An object can be given an approximate date by dating the volcanic layers occurring above and below the object.The level of nitrogen gradually reduces as the bone decays.Absolute dating is not possible with this method because the rate at which the nitrogen content declines depends on the surrounding temperature, moisture, soil chemicals and bacteria.The technique can, however, provide the relative ages of bones from the same site.Most fossils are found in sedimentary rocks deposited in layers.

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