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5. Volcanic Hazards and Impacts

This page develops the scale and severity of different hazards Syllabus 4.2.6 Volcanic hazards: lava flows, ash falls, lahars, pyroclastic flows, tephra, volcanic rocks, toxic gases; the significance of speed, size, frequency, and spread. In 1980 Mount St Helens, in the USA erupted following more than 100 years of dormancy. The power of its eruption took many scientists by surprise and it remains today one of the...

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