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Eruptive Background: Ancestral Mount St. Helens began to grow before the last major glaciation of the Ice Age had ended about 10,000 years ago. The oldest ash deposits were erupted at least 40,000 years ago onto an eroded surface of still older volcanic and sedimentary rocks.

 
 
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ITEM (2): LANDSAT Sees Mount St. Helens, 1996 - Landsat satellite data from 1996 shows the blown-out side of the crater wall sixteen years after the last major eruption of Mount St. Helens.

 
 
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St. Helens to decide whether it's going to blow, commentator Christine Hemp recalls her father's fascination with the volcano's catastrophic eruption in 1980.

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