[Answer] 4. A precursor to this May 1980 eruption included earthquakes and a bulge in the mountain. When it erupted, the forests surrounding the volcano were destroyed and 57 people lost their lives.

Step 1 : Introduction to the question "4. A precursor to this May 1980 eruption included earthquakes and a bulge in the mountain. When it erupted, the forests surrounding the volcano were destroyed and 57 people lost their lives."

...1. Mount Vesuvius 2. Mount Etna 3. Mount St. Helens 4. Krakatoa Before this eruption, Mount St. Helens had been dormant (inactive) for 123 years. It is located in Washington State, USA, and is one of many volcanoes in the Cascade Range, a mountain range that extends from southern British Columbia, Canada to Northern California.

Step 2 : Answer to the question "4. A precursor to this May 1980 eruption included earthquakes and a bulge in the mountain. When it erupted, the forests surrounding the volcano were destroyed and 57 people lost their lives."

Mount St. Helens:

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