2 long term impacts on Mt. St. Helens:
The formation of the volcano is now completely changed. The stratovolcano's northside completely collapsed during the 1980 eruption leaving a gaping crater.
The ecosystem was also majorely impacted...rivers and streams contained the contaminated sediments for more than a decade.
The eruption of Mt. St. Helens is similar to another stratovolcano in Mexico, El Chichon.
Their pyroclastic flows were the first the first ones studies using modern techniques.
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