Dating rocks with uranium 238

Radiometric dating is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials.There are a number of techniques that might be used.

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The process of dating finds the two ratios between uranium-235 and lead-207; and uranium-238 and lead-206.One method to date rocks, if you know their origins, is to compare their location to locations of other rocks of known age.Rocks found in the earth are usually older than the rocks found above them.Carbon-14 is present in the air, and is absorbed by plants during photosynthesis.When animals/people eat plant matter, they absorb the carbon-14 from the plants into their bodies.

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