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Lassen Park
Bumpass Hell : residual mass of cooling andesite lava perhaps 3 miles deep and boiling lakes. Andesite lavas decompose readily but sulfuric acid and hot steam have greatly speeded up the process to carve out this barren 16-acre bowl. The "rotten egg" smell is hydrogen sulfide fumes, rising from deep within this mass.
Bubbling mud : natural hot tubs in the spring, when rain and melting snow provide abundant water, hot pods shrink to mudpots, spattering clay formed from decomposed lavas.
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