Why was Mount St. Helens so destructive?
Tuesday, May 18, 2010 - 09:30
in Earth & Climate
In just three minutes, the blast of the Mount St. Helens volcanic eruption hurled 3.7 billion cubic yards of fiery rock and dust over 230 square miles of pristine forest landscape on May 18, 1980. Mount St. Helen - Types of volcanic eruptions - Washington - United States - Cubic yard