C Mt St Helens is a volcano but Hawaii doesnt have any volcanoes and never has

C mt st helens is a volcano but hawaii doesnt have

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C., Mt. St. Helens is a volcano, but Hawaii doesn’t have any volcanoes, and never has. D., Mt. St. Helens is a low-silica, quietly erupting shield volcano, and Hawaii has medium-to- high-silica, explosively erupting stratovolcanoes. E., Mt. St. Helens is a medium-to-high-silica, explosively erupting stratovolcano, and Hawaii has low-silica, quietly erupting shield volcanoes. The low-silica lava from the Hawaiian hot spot flows easily without large explosions, so the lava spreads out to make broad, gentle volcanoes that look like shields of medieval warriors. Melt a little basaltic sea floor with some water and sediment, and you get silica-rich andesite feeding explosive, subduction-zone stratovolcanoes such as Mt. St. Helens. Hot spots and spreading ridges make low-silica, basaltic volcanoes, which don’t explode powerfully. Mt. St. Helens is a stratovolcano, but stratovolcanoes are steep, not broad and flat. Mt. St. Helens was the most active of the Cascades volcanoes even before its big 1980 eruption, and the volcano has erupted many times since the big eruption. , Points Earned:, 1/1 Correct Answer:, E Your Response:, E 10. , You get in your Magic School Bus, drive down the throat of a volcano, and find that you are driving through melted rock that does not make lumps but flows more easily than does most melted rock. It is likely that the melted rock you are driving through: , A., Is especially low in water and carbon dioxide compared to most melted rocks. B., Is being stirred rapidly by Teletubbies. C., Is especially rich in water and carbon dioxide compared to most melted rocks. D., Is especially poor in iron and other things that would get between silicon-oxygen tetrahedra, compared to most melted rocks. E., Is especially cool compared to most melted rocks. The silicon-oxygen tetrahedra link up to make lumps, so anything that gets in the way of this linking will oppose lumping. Iron, water, carbon dioxide, or high heat that shakes the lumps apart can all oppose the lumping of polymerization. , Points Earned:, 0/1 Correct Answer:, C
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Your Response:, A , 11., Look at the picture above. Here is new land forming in Hawaii, where lava enters the sea. What is happening here? 12. , Earthquakes can be caused in many different ways. The best interpretation of the planet’s
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  • Fall '08
  • Earthquakes, Correct Answer, Volcano, St. Helens, Points Earned

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