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The eruption of Mt. St. Helens triggered the fastest avalanche. The avalanche was moving at a speed of 250 mph down the mountain's north slope.

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The fastest avalanche on record occurred in 2003 on Mount Steller in Alaska, reaching speeds of about 186 miles per hour (300 km/h). This type of avalanche is known as a powder avalanche, which is the fastest and most destructive type of avalanche.

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10mo ago
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Q: What is the fastest avalanche?
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