NOUN
- an active volcano in the Cascade Range in southwestern Washington; erupted violently in 1980 after 123 years of inactivity
How To Use Mt. St. Helens In A Sentence
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- When the glacial ice on Mt. St. Helens rushed down the sides of the mountain and created mudflows, potential energy in the ice became active and major changes took place.
- We were told at the ‘visitor centre’ that Mt. St. Helens had a ‘Pyroclastic flow’, which is an eruption of volcanic ash and pumice as opposed to molten lava.
