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The Earth's Ring of Fire
An overview and map of this area circling the Pacific Ocean. "The zone — the 'Ring of Fire' — notorious for frequent earthquakes and volcanic eruptions, coincides with the edges of one of the world's main tectonic plates. More than half of the world's active volcanoes above sea level are part of the ring." From the British Broadcasting Corporation (BBC).
http://news.bbc.co.uk/2/hi/136248.stm

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