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Chapter 8: Igneous Activity

1. What triggered the May 18, 1980, eruption of Mount St. Helen? (Box 8.1 Mount St. Helens: Anatomy of a Eruption). The trigger was a medium sized earthquake. Its vibrations sent the north slope of the cone plummeting into the Toutle River, removing the overburden that had trapped the magma below.

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Chapter 8: Igneous Activity

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