Present and future volcanic hazards in the united

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Present and Future Volcanic Hazards in the United States Hawaii: active and dormant volcanoes Cascade Range: a series of volcanoes in the western United States and southwestern Canada resides above the Pacific Northwest subduction zone The Aleutians: South-central Alaska and the Aleutian island chain sit at a subduction zone Long Valley and Yellowstone Calderas
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Cascade Volcanoes
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Long Valley Still active - seismic tremor, bulging, gas emissions
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At a mid-ocean ridge, rising asthenosphere melts to form magma. But that's not the whole story. Asthenosphere is composed of a variety of minerals, with a range of melting temperatures. Those minerals with the lowest melting temperatures, the ones richest in silica, are the ones that melt and become magma. This is called partial melting and results in magma that is _______________ the asthenosphere from which it was derived. A. more mafic then B. the same as C. more felsic then D. hotter than E. none of the above
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Composite volcanoes are often the sources of devastating pyroclastic flows and lahars. This is in part because composite volcanoes have little structural strength. They are weak because A. they are made of alternate layers of lava and pyroclastic debris, not a strong combination. B. they have steep sides and so pyroclastic flows and lahars move a lot faster. C. they are composed of felsic rocks, which weather much quicker then their mafic counterparts. D. they are found in more earthquake prone areas which tend to shake them apart over the years. E. all of the above
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  • Fall '19
  • Volcano, Mantle, Cascade Volcanoes, Cinder Cones, • Pyroclastics, Volcanoes Formation

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