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Slide description and index card: Aerial photographs of the lava dome that extruded into the crater of Mount St. Helens during the latter part of June 1980.The volcano's dacite lava has a pasty consistency when it is molten, and it tends to pile up rather than to flow laterally. This dome, which was largely destroyed in a subsequent eruption on July 22, 1980, was, at this stage, about 1,200 feet across and 200 feet high. Its rough, shattered appearance resulted mainly from the expansion and shattering of the solidified outer crust as more molten lava was forced upward by the great pressure in the magma chamber underlying the volcano. B, View from the west over the crater rim from a helicopter taking geologists to...
    map background search result map search result map Aerial view from the west over the crater rim from a helicopter taking geologists to collect samples and measure temperatures inside the crater. Mount St. Helens, Skamania County, Washington. 1980. Aerial view from the west over the crater rim from a helicopter taking geologists to collect samples and measure temperatures inside the crater. Mount St. Helens, Skamania County, Washington. 1980.