St. Helens
Erupted in 1980
St.
Helens most often refers to Mount St.
Helens, a volcano in Washington State whose catastrophic 1980 eruption killed dozens and blanketed the Pacific Northwest in ash.
The name also belongs to a town in England and several other places named after Saint Helena of Constantinople.
Impact or volcanic basin
- domeRounded vault forming roof
- magmaMolten rock underground
- lavaErupted liquid stone
- calderaCollapsed volcanic summit basin
fumarole · vent · andesite · volcanic ash · stratovolcano · magma chamber · volcanic bomb · sulfur dioxide
Hot volcanic gas-debris mixture
- ashfallAirborne volcanic debris descending
- laharVolcanic debris flow
- mudflowFast-moving liquefied earth
- bulgeOutward curved projection
Harry Truman · blast zone · devastation · shockwave · plume · ash cloud · tephra · pumice
Study of rock layers
- tectonicsStudy of crustal deformation
- subductionPlate descending beneath another
- igneous rockCrystallized molten material
- basaltFine-grained volcanic stone
pumice · sediment · lithosphere · fault · seismology · erosion · glaciation · geologic history
Information point for guests
- hikingRecreational trail walking
- trailPath through wilderness
- viewpointWay of seeing things
- scenicOffering beautiful views
tourism · photography · panorama · recreation · interpretation · conservation · natural wonder · wilderness
Pacific Northwest mountain range
- Pacific NorthwestCoastal American region, northward
- Castle RockFictional Maine township
- LongviewConsideration of future consequences
- PortlandMajor Oregon city
Seattle · Mount Rainier · Columbia River · Puget Sound · Olympia · Interstate 5
crater
Impact or volcanic basin
caldera · fumarole · vent · andesite · volcanic ash · stratovolcano · magma chamber · volcanic bomb · sulfur dioxide · steam
pyroclastic flow
Hot volcanic gas-debris mixture
- ashfallAirborne volcanic debris descending
- laharVolcanic debris flow
- mudflowFast-moving liquefied earth
Harry Truman · bulge · blast zone · devastation · shockwave · plume · ash cloud · tephra · pumice · evacuation
stratigraphy
Study of rock layers
- tectonicsStudy of crustal deformation
- subductionPlate descending beneath another
- igneous rockCrystallized molten material
basalt · pumice · sediment · lithosphere · fault · seismology · erosion · glaciation · geologic history · formation
visitor center
Information point for guests
scenic · tourism · photography · panorama · recreation · interpretation · conservation · natural wonder · wilderness · camping
Cascades
Pacific Northwest mountain range
- Pacific NorthwestCoastal American region, northward
- Castle RockFictional Maine township
- LongviewConsideration of future consequences
Portland · Seattle · Mount Rainier · Columbia River · Puget Sound · Olympia · Interstate 5
- volcanoesvolcano, volcanic eruption, Mount Fuji, volcanic eruptions, caldera
- Columbia CountyHudson, Bloomsburg, Chatham, Rainier, Millville
- mountainsmountain, peaks, peak, summit, summits
- Pacific NorthwestAlaska, Seattle, Oregon, Vancouver, Washington
St. HelensMauna Kea
Hawaii's highest volcano
dormant volcano · extinct volcano · Devils Tower · shield volcano
St. HelensCanadian Shield
Ancient exposed continental crust
Mount Rainier · Appalachian Mountains · Mount Fuji · Scottish Highlands · shield volcano