A volcano explodes

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Q1: How did Mt St Helens explode?

[Answer]

One of the most dramatic violent eruptions of modern times took place in 1980 when a volcano in the Cascade Mountains of North America exploded with little warning.

Mt St Helens literally blow away the top of its mountain in an awesome eruption that began at 8.32 am on a fine May morning.

The picture loop gives the full story.