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Exam (elaborations)

ISP 203B EXAM 2 Questions With Solutions

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  • ISP-203B

ISP 203B EXAM 2 Questions With Solutions Strato-Volcanoes - Very steep, tall, conical mountains formed of strata (layers) of lava flows and pyroclastic flows. - Associated with dangerous ash clouds and pyroclastic flows. - They may have lava domes at the summit. Calderas - Very large voids f...

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  • October 19, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
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  • ISP-203B
  • ISP-203B
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ISP 203B EXAM 2 Questions With Solutions

Strato-Volcanoes - Very steep, tall, conical mountains formed of strata (layers) of lava

flows and pyroclastic flows.

- Associated with dangerous ash clouds and pyroclastic flows.

- They may have lava domes at the summit.




Calderas - Very large voids formed by large explosions of magma that destroyed

previously existing volcanic shapes.

- Depressions that are often filled by lakes.




Typical Eruption Warning - Includes increasing seismicity (earthquakes)


- Increase in degassing

- Ground movements

- Changes in ground temp.

- Small short-lived eruptions may announce a larger one




Typical Eruption Warning probs... - Most of these events are not followed by a major

eruption

- Evacuations are costly and if no eruption follows scientist credibility is reduced.

, ISP 203B EXAM 2 Questions With Solutions
- However, lack of evacuation has been the origin of terrible volcanic disasters




Mt. Vesuvius - Strato volcano in S Italy


- Near populated Naples Italy

- Most famous for the Pompeii eruption in AD 79, which got buried in ash fallout and pyroclastic

flows




Large Volcanic Eruptions - Have the capability to affect the Earth's global climate, at least

for a few years.

- Very large ash clouds stall in the high atmosphere, where they block parts of the radiation that

Earth receives from the sun. Less radiation= Cooler temps.

- Volcanic gases can have similar affect




Mt. Pinatubo, Phillipines June 12-15 1991 - 2nd largest eruption of 20th century


- 5km of magma

- Had been dormant for 500 years

- Death toll was low (740), because of awareness and quality evac policies




Mt. Tambora, Indonesia 1815 - Largest eruption known in historical times

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