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18.1 Notes: Hawaiian – Type Volcano

18.1 Notes: Hawaiian – Type Volcano. Describe: Weakest eruption; lava travels very slowly & far. Fissure Eruption. Describe: When lava is released through surface fissures (cracks) instead of out of the central vent of a volcano. . Low-Viscosity Magma. Describe:

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18.1 Notes: Hawaiian – Type Volcano

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  1. 18.1 Notes: Hawaiian – Type Volcano Describe: Weakest eruption; lava travels very slowly & far

  2. Fissure Eruption Describe: When lava is released through surface fissures (cracks)instead of out of the central vent of a volcano.

  3. Low-Viscosity Magma Describe: The eruption is weak & can travel long distances because pressure doesn’t build

  4. Eruption Types High-Viscosity Magma Describe: Pressure builds because the magma is not able to flow fast. This can produce violent eruptions.

  5. Types of High-Viscosity Eruptions Strombolian Describe: Short explosions that shoot out a small amount of very thick lava, often producing cinder cones

  6. Vulcanian Describe: Small, Violent plumes of steam, ash, & gas up to 16km. Magma is thick, pasty, filled w/ gas. Intermittent explosions as gas released. Often forms cinder cones.

  7. Pelean Describe: Key components: glowing avalanche of hot gases, ash, & rock pour down at speeds greater than 160km/h. Common for composite cone volcanoes.

  8. Plinian MT St Helens for example Describe: Largest & most violent explosive eruptions large ejections of pumice & ash that can reach heights of 50km & spread to large areas downwind. Can affect weather!

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