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Absolute dating of rocks

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Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Radioactive elements decay The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms. When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside.
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Radiometric dating

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Dating Rocks and Fossils Using Geologic Methods | Learn Science at Scitable

Choose the best methods for finding the absolute dates of different rock layers. You will need the Adobe Flash Player to view this. This interactive asks you to choose the best absolute dating method for each layer of rock in a cliff. Your choice will depend on the material present in each rock. We have found this cliff and collected samples from the layers of sedimentary rocks. We know the oldest rocks are at the bottom and the youngest are at the top, but we want some actual dates.
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Absolute dating

This page has been archived and is no longer updated. Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free. These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing. As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.
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Relative dating is used to determine the relative order of past events by comparing the age of one object to another. This determines where in a timescale the object fits without finding its specific age; for example you could say you're older than your sister which tells us the order of your birth but we don't know what age either of you are. There are a few methods of relative dating, one of these methods is by studying the stratigraphy.

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