don't know the difference between a crater and a caldera? Check link...
Eruptive plume from an eruption of Kanaga in Alaska. None of the material being erupted is smoke. Image: Public Domain.
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Related item: The Ten Most Dangerous Volcanoes
the problem? some "active" volcanoes stay quiet, and some new ones (e.g. Pinatubo) are newly noticed only when they started to erupt...
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