Threat of Columbia's Nevado del Ruiz volcano that once killed 25,000 is looming again
The Nevado del Ruiz is one of the many volcanoes found on the Ring of Fire; a ring of volcanoes and earthquakes that surrounds the Pacific basin.
The Nevado del Ruiz is one of the many volcanoes found on the Ring of Fire; a ring of volcanoes and earthquakes that surrounds the Pacific basin.
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