ENV 1101 Lecture Notes - Lecture 3: Mount St. Helens, North American Plate, Explosive Eruption
23 Dec 2016
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Document Summary
For 120 years the volcano has been inactive. Largest landslide in recorded history. millions of tons of magma erupts. Poisonous steam and ash miles into the air. Even those who were in places considered safe. 200 square miles - the bow down zone where wildlife was destroyed. Avalanche has lifted the nearby lake, and degassed, polluted by the explosion. Volcano is still steaming and rumbling even after weeks. 500 years ago two explosions within two years. The pacific plate is sliding under the north american plate. Search for signs of life, found northern pocket golfer burrowing in the ground. Even by fall, the volcano is still active. 4 miles from the volcano"s crater, a plant was found flourishing in the barren are. Bacteria provides the fertilizer, (nitrogen fixation) the plant provides bacterium with sugars. During the preceding moth, lava has been oozing out of this lava dome, and this dome has been growing, actively seeming.
