- Eruption Frequency: Erupts every few centuries; last major eruption in 1980, with smaller activity continuing until 2008.  

- Hazards: Pyroclastic flows, lahars (mudflows), ashfall, landslides, shockwaves.  

- Eruption Type: Explosive (Plinian & Pelean).  

- Magma Viscosity: High (andesitic to dacitic lava).  

- Dissolved Gas Content: High, contributing to explosive eruptions.  

- Physical Features: Steep cone shape, crater from 1980 blast, lava domes, ash deposits, landslide scars.  

- Evidence of Last Eruption:  

  - Large crater formed by the 1980 eruption.  

  - Pyroclastic deposits and ashfall covered large areas.  

  - Lahars reshaped river valleys.  

- Eruption Frequency: Erupts roughly every 5-10 years; last eruption in 2022.  

- Hazards: Fast-moving lava flows, volcanic gases, earthquakes.  

- Eruption Type: Effusive (Hawaiian-style lava flows).  

- Magma Viscosity: Low (basaltic lava).  

- Dissolved Gas Content: Low to moderate.  

- Physical Features: Broad, sloping profile, lava tubes, rift zones, summit caldera.  

- Evidence of Last Eruption:  

  - 2022 eruption sent lava flows near communities.  

  - New basaltic lava fields.  

  - Gas emissions impacted air quality. 

- Eruption Frequency: Erupted once from 1943-1952 and is now dormant.  

- Hazards: Ashfall, lava flows, gas emissions.  

- Eruption Type: Strombolian (moderate explosions of lava and ash).  

- Magma Viscosity: Low (basaltic lava).  

- Dissolved Gas Content: Moderate.  

- Physical Features: Small cone-shaped hill, crater at summit, surrounding lava fields.  

- Evidence of Last Eruption:  

  - Buried towns like San Juan Parangaricutiro under lava.  

  - 424-meter-high cinder cone remains.  

- Eruption Frequency: Last major eruption 640,000 years ago; smaller hydrothermal explosions occur regularly.  

- Hazards: Supervolcanic ashfall, climate impacts, earthquakes, hydrothermal explosions.  

- Eruption Type: Ultra-Plinian (extremely explosive).  

- Magma Viscosity: Very high (rhyolitic lava).  

- Dissolved Gas Content: Extremely high.  

- Physical Features: Large caldera, geysers (Old Faithful), hot springs, fumaroles.  

- Evidence of Last Eruption:  

  - Lava flows dating back thousands of years.  

  - Geysers and hot springs release volcanic gases.  

  - Calderas from past eruptions visible.  

- Physical Features: Steep cone, snow-covered peak, multiple craters- Type: Composite/Stratovolcano  

- Eruption Frequency: Last erupted in 1707; erupts every few hundred years.  

- Hazards: Ashfall, pyroclastic flows, lahars, earthquakes.  

- Eruption Type: Vulcanian and Plinian.  

- Magma Viscosity: High (andesitic to basaltic lava).  

, volcanic vents.  

- Evidence of Last Eruption:  

  - Ash deposits from the 1707 eruption.  

  - Earthquake-triggered eruption left cinder cones and vents.  

- Eruption Frequency: Last major eruption 7,700 years ago.  

- Hazards: Hydrothermal explosions, gas emissions, earthquakes.  

- Eruption Type: Plinian (cataclysmic explosion).  

- Magma Viscosity: Very high (rhyolitic lava).  

- Dissolved Gas Content: High.  

- Physical Features: Deep lake, Wizard Island (cinder cone in the lake), steep caldera walls.  

- Evidence of Last Eruption:  

  - Ashfall found across North America.  

  - Collapse of Mount Mazama formed a deep volcanic lake.