When Mount St. Helens erupted, trapped gases caused the north side of the mountain to explode. Volcanic ash was ejected high into the atmosphere.
https://www.powershow.com/view4/7a56d8-OGI4Z/When_Mount_St_Helens_erupted_trapped_gases_caused_the_north_side_of_the_mountain_to_explode_Volcanic_ash_was_ejected_high_into_the_atmosphere_powerpoint_ppt_presentation
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