6 what are vesicles page 99 para 1 vesicles are

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rate of supply of magma from depth. 6. What are "vesicles"? (page 99, para 1) Vesicles are bubble holes that gas can stay trapped in 7. How does the average rate of magma production from the Hawaiian volcanic vents compare to the amount of magma withdrawn from only just beneath the summit of the volcanoes. what implications does this have for the future of Hawaiian eruptions? (page 99, para 1 to page 100) The average rate of magma production in the first years of eruption was about 120 million cubic meters per year. Although the net tilt change during the past 14 years shows that the summit has subsided, the amount of magma withdrawn from beneath the summit has been small compared with the total amount of magma erupted. The balance between the eruption rate implies that the eruption could be very long lasting. 8. Why does a fissure eruption's characteristics change over time? (page 100, para 1 to page 102) Magma is hot enough to melt the wall rocks and enlarge the channels through wich it moves. This is thought to be the reason that a fissure eruption usually becomes localized at a single vent as a Hawaiian eruption progresses. When a fissure is narrow, less lava can flow through it- wider places in the fissure are enlarged as hot magma rapidly surges through them, hence they increase in width and capture more and more of the flow.
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9. What chemical and temperature changes occur as Kilauea eruption progresses and why
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  • Fall '08
  • Campbell-mccrea,M
  • Volcanology, Volcano, Kīlauea

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