pyroclastic
Hot volcanic fragments
Pyroclastic describes volcanic material explosively ejected during an eruption—rock fragments, ash, and hot gases.
A pyroclastic flow is a fast-moving, ground-hugging avalanche of superheated debris that races down volcanic slopes, destroying everything in its path: The pyroclastic flow from Mount Vesuvius buried Pompeii.
From Greek roots meaning "fire" and "broken."
Ejected volcanic material
- pumiceLightweight volcanic abrasive
- scoriaPorous volcanic ejecta
- ashCombustion's powdery remains
- bombExplosive device or disaster
block · fragment · ejecta · fallout · airfall · ballistic · accretionary · juvenile
Solidified volcanic ash
- brecciaCemented angular rock fragments
- agglomerateCollected into dense mass
- depositPlace for safekeeping
- stratumHorizontal layer of material
layer · welded · caldera · stratovolcano · vent
Sudden powerful increase
- avalancheRapid mountain snow collapse
- devastationSevere widespread destruction
- incinerationBurning waste to ash
- PompeiiVolcano-buried Roman city
Herculaneum · emplacement · runout · channelized · welding
Volcanic debris flow
- mudflowFast-moving liquefied earth
- ashfallAirborne volcanic debris descending
- burialPlacing deceased underground
- suffocationFatal lack of air
collapse · destruction · evacuation · monitoring · warning system · exclusion zone · casualties · infrastructure damage
tephra
Ejected volcanic material
bomb · block · fragment · ejecta · fallout · airfall · ballistic · accretionary · juvenile · lithic
tuff
Solidified volcanic ash
- brecciaCemented angular rock fragments
- agglomerateCollected into dense mass
- depositPlace for safekeeping
surge
Sudden powerful increase
- avalancheRapid mountain snow collapse
- devastationSevere widespread destruction
- incinerationBurning waste to ash
Pompeii · Herculaneum · emplacement · runout · channelized · welding
lahar
Volcanic debris flow
- mudflowFast-moving liquefied earth
- ashfallAirborne volcanic debris descending
- burialPlacing deceased underground
suffocation · collapse · destruction · evacuation · monitoring · warning system · exclusion zone · casualties · infrastructure damage · crop destruction
silica
Silicon dioxide compound
- volcanic activityeruption, active, lava, dormant, magma
- volcanoesvolcano, Mount Fuji, caldera, lava, crater
- volcano wordsactive, dormant, extinct, molten, eruptive
- Hawaiian VolcanoesKilauea, Mauna Loa, Haleakala, volcano, volcanoes
- igneous geologymagma, lava, basalt, granite, rhyolite
- volcanic texturesvesicular, glassy, frothy, bubbly, aa
pyroclasticintrusive
Invading others' privacy
plutonic · massive · unfragmented · crystalline · intact
- pyroclastic flowHot volcanic gas-debris mixture