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The Most Dangerous Volcanoes in the U.S. The most dangerous volcanoes in the U.S. are all composite volcanoes along the American Ring of Fire on the U.S. West Coast and Alaska, except for the two shield volcanoes on the Big Island of Hawaii. Mauna Loa and Kilauea are ranked #8 and #1 respectively.
Composite volcanoes are not only the most iconic and famous volcanoes on Earth, they are also the most dangerous. Composite volcanoes are built up by the debris of previous eruptions: lava, volcanic ash and rock. For a composite volcano to reach 10,000 feet, it takes multiple eruptions over hundreds of thousands of years.