• An explosive eruption produces huge clouds of volcanic ash.
  • The material may form a mushroom cloud, just like a nuclear explosion.
  • Some ash may stay in the atmosphere for years.
  • This changes weather patterns and affects the temperature of the Earth.
  • For a year or two after a large eruption, sunsets may be especially beautiful worldwide.
  • The temperature inside a pyroclastic flow may be as high as 1,000°C (1,800°F) The gas pressure grows until it must be released.
  • The volcano erupts in an enormous explosion.
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