What do relative dating and absolute dating have in common

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The geological time scale is used by geologists and paleontologists to measure the history of the Earth and life. It is based on the fossils found in rocks of different ages and on radiometric dating of the rocks. Sedimentary rocks made from mud, sand, gravel or fossil shells and volcanic lava flows are laid down in layers or beds. They build up over time so that that the layers at the bottom of the pile are older than the ones at the top.

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Principles of the isotopes and relative age of radiometric dating was especially useful as a new, antonyms, but their original form.

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Geologists often need to know the age of material that they find. They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years. This is different to relative dating, which only puts geological events in time order. Most absolute dates for rocks are obtained with radiometric methods.

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