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However, they do not reveal the relative ages of rocks preserved in two different areas. The Earth is like a gigantic magnet. On the other hand, the concentration of carbon falls off so steeply that the age of relatively young remains can be determined precisely to within a few decades. After another 5, years, only one-quarter of the original carbon will remain. This page has been archived and is no longer updated. Small magnetic grains in rocks will orient themselves to be parallel to the direction of the magnetic field pointing towards the north pole. Geologists often need to know the age of material that they find.

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