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Geology notes september 22

Geology notes september 22 - Lava fountains no more than a...

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Geology Exam 40 multiple choice and 10 matching (answers can be used for than once) -Volcanic eruptions -Volcanic eruptions are driven by escaping volatiles “Soda Pop” theory of eruption -Eruption type is related to magma composition *Andesite are the most dangerous (Pelean, Plinian, and Vulcanian) *Basalt eruptions are not that dangerous (Icelandic, Hawaiian, and Strombolian) -Plinian eruptions are produced by boiling magma where the bubbles burst to make glassy fragments of volcanic ash. *Plinian eruptions can eject volcanic ash and volatiles into the sstratosphere *Most dangerous, driven by Felsic magma and are water rich. *Pyroclastic flows are a mixture of very hot volcanic ash and gas that t flow down the flank of a volcano. -Vulcanian and Strombolian eruptions are a mixture of lava flows and ejected cinders and bombs.
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*basalt magma *scoria (cinders) -Hawaiian and Icelandic eruptions produce basalt lava flows
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Unformatted text preview: * Lava fountains, no more than a couple hundred feet in the air *Can flow at high speeds (30mph)-The volcano Explosivity Index (VEI) ranks volcanoes by the amount of magma erupted *0-2 very small chambers, not very dangerous eruptions, basalt eruptions *7-8 very dangerous, Felsic eruptions (andesite and rhyolite) *VEI is related water content and viscosity, which are controlled by magma composition *VEI and eruption type correlate to magma composition, magma chamber depth, and time between eruptions -Calderas form when very large magma chambers empty and collapse *EX. Crater Lake, Oregon *Yellowstone National Park is an excellent example of a collapsed caldera *3 cycles of Yellowstone eruptions began 2.2 million years ago and ended 600,000 years ago. Magma is still present below the park at 15 km depth *The Yellowstone caldera continues to show tectonic and hydrothermal activity...
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