America is home to 169 volcanoes that extend miles within the ground, waiting to awaken, but experts have classified 18 as the highest threat to the nation.The sleeping giants are located in Washington, , , , American Samoa and , with some experienced explosions in recent years.The report from the US Geological Survey (USGS) notes that 13 of the volcanoes are located in densely populated and highly developed areas, and the rest sit in places that would disrupt international aviation if they were to erupt.
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