TOP TEN PHOTO GALLERIES: Most Viewed of 2008

TOP TEN PHOTO GALLERIES: Most Viewed of 2008
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6. Chile Volcano Erupts With Ash and Lightning

After 9,000 years of silence, Chile's Chaiten volcano erupted, generating on May 3 what may have been a "dirty thunderstorm." These little-understood storms may be caused when rock fragments, ash, and ice particles collide to produce static charges--just as ice particles collide to create charges in regular thunderstorms.

The eruption, which continued off and on for months, forced the evacuation of thousands of residents and cattle from this corner of Patagonia.

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—Photograph by Carlos Gutierrez/UPI/Landov
 
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