Issue Date: September 8, 2008
Trees Testify To Pollution
TREES HAVE STORIES to tell. Within their annual growth rings are records of drought and deluge, but scientists can also use them to reconstruct environmental pollution events. Tree rings can be used to determine how far a pollutant plume has traveled in soil or groundwater. And because each ring is essentially a time stamp, scientists can use tree rings to figure out when that pollution occurred.
Dendrochemistry, the chemical analysis of precisely dated tree rings, . . .
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