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N028A99x30-1 "Kilauea" Hawaii, March 1999 The plume you see in this image is from an erupting volcano. Specifically, Hawaii's Kilauea. Kilauea is referred to as a "shield" volcano. Unlike Washington state's Mt St. Helens, which is a "strato" volcano. Shield volcano eruptions tend to be less explosive, and take the form of simple outpourings of lava, lasting for long periods of time. For example. Lava flow from Kilauea was almost continuous from 1983 to 2018. The dark rock in this images foreground is from a 3 or 4 foot thick flow, that has hardened, covering what was once a modern highway.