· Colombia's Nevado del Ruiz volcano has been hit with 6,000 quakes per day
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· The volcano last erupted in 1985, killing 25,000 people in nearby villages
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· READ MORE: Researchers reveal the world's five deadliest volcanoes
· Colombia's Nevado del Ruiz volcano has been hit with 6,000 quakes per day
·
· The volcano last erupted in 1985, killing 25,000 people in nearby villages
·
· READ MORE: Researchers reveal the world's five deadliest volcanoes