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Determining absolute ages radiometric dating

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The absolute age of an Earth material is a measure of how old it actually is in years.

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Volcanic rocks – such as tuff and basalt – can be used in dating because they are formed at a particular moment in time, during an eruption.There are two main categories by which they do this: relative age dating and absolute age dating.In relative age dating, scientists study a material and compare it to other similar materials in order to establish a timeline. To better understand these concepts, let's look at an archeological example: Imagine we are a group of archeologists studying two different trash pits recently discovered. Nelson Tulane University In order to understand how geologists deal with time we first need to understand the concepts of relative age and absolute age.Stratigraphic Superposition - Because of Earth's gravity, deposition of sediment will occur depositing older layers first followed by successively younger layers.