SCIENCE STUDIO: Tree Ring Analysis

In a rebroadcast from October 4, 2009, Keith talks with Paul Sheppard of the Laboratory of Tree-Ring Research at the University of Arizona.  Sheppard talks about the science of dendrochemistry, or tree ring analysis, and how it can reveal the history of past weather patterns, volcanic eruptions, and earthquakes.  http://ltrr.arizona.edu

Aired June 23, 2013.