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Title          
Radiometric Dating Revisited 
   
 
Abstract
Radiometric dating (often called radioactive dating) is a technique used to date materials, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1] It 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. Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change. Radiometric dating is also used to date archaeological materials, including ancient artifacts. Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.
 
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Added By - justin
Subject - Earth and Atmospheric Sciences
Document Type - Definition
Video Duration - 00:03:07
 
 
 

 

Title          
NASA: Exploring Ozone 
   
 
Abstract
For more information:http://www.nasa.gov/vision/earth/environment/ozone_resource_ page.htmlThis short video combines dynamic ozone visualizations with an int...
 
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Added By - appliedmath
Subject - Earth and Atmospheric Sciences
Document Type - Documentary
Video Duration - 00:02:20
 
 
 

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