Mount St. Helens in the USA erupted 18th May 1980 with such force it left 12 kilometres (8 miles) of shattered countryside behind causing rivers to flood, sweeping up vehicles and houses.
The landslide that followed turned more than 52.000 hectares ( 130.000 acres) of beautiful mountain scenery into a devastated wasteland. Mount St. Helens forms part of the Cascade Range in northwest America.
The once beautiful snow-capped mountain was a favourite holiday spot for thousands of climbers and campers.
In March 1980, the peace was disturbed by tremors and geologists working in the area knew something was going to happen. Two months later 57 people died when it erupted.
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