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St Helens, Mount
     
St Helens, Mount
a volcano in Washington State in the northwestern US, which erupted in 1980 after a quiet period of over a hundred years, sending out ash (=powder produced when something has been burnt) and lava (=hot liquid rock) over a wide area. The large amount of ash in the air affected the weather in many northern parts of the world for some time.
Definition from the Longman Dictionary of Contemporary English
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