-seep out of cracks/during eruption
-SO2, H2S (sulfur dioxide) are TOXIC to plants and animals
-least dangerous to life because they are slow
-they're dangerous when they mix with snow and mud
--large scale=large distances
-affects air traffic
-material ejected with high force
-devestating for human health
-move fast so you can't escape
-snow and ice accumulation
-debris cloud moved long distances
-conifer forest destroyed
-lot of debris flow clogging rivers
-25 yrs later: mudflow is still visible on rivers
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