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Audio Video Interleaved Video  |  2001-11-18  |  2.2 MB  |  160x120  |  15fps  |  39 seconds
Transcription: Volcanic eruptions take different forms depending on the composition of the magma ejected from the volcano. The less gas dissolved in the magma, the quieter the eruption. This type is called a Hawaiian eruption. The lava flows down the slope of the volcano. It is, however, capable of great destruction should anything stand in its path. Magmas with high gas content usually cause explosive eruptions and this Plinian eruption of Mount St. Helens in In 1980, the gas-rich magma was blown high into the air, filling thousands of acres of trees and raining down a fine ash that covered everything for m ...