What are the short- and long-term effects of Mount St. Helens' eruption?

Answer

In the short term, half of the north face of Mount St. Helens exploded, and all life around the mountain was destroyed for miles around. Longer term effects were the 1/4 cubic mile of ash that was thrown into the air and killed 12% of crops that were downwind of the volcano. The ash limited transportation from the area and damaged modern equipment like turbines, sewage systems, and water treatment systems. More than two hundred homes were destroyed by the blast.
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