The most powerful volcanic eruption of the 20th century happened in Alaska at a volcano named Novarupta. Because Novarupta was located so near the Arctic, it did some curious things to Earth's climate. Almost a century after the blast, researchers are beginning to understand what happened.

FULL STORY at

http://science.nasa.gov/headlines/y2006/03oct_novarupta.htm?list882224

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