Kilauea, a volcano in Hawaii, generates fluid, extensive lava flows. Mount St. Helens, a volcano in Washington State, can produce lava flows that are short and thick, but that can also erupt violently and generate large volumes of ash
What might these differences indicate about each lava's silica content and temperature?
What will be an ideal response?
Answer: The silica content can affect the temperature and the viscosity of the lava. The more silica that is present, the lower the temperature of the lava and therefore the higher the viscosity. Lava from Kilauea is low in silica and has a high temperature, producing thin, runny lava that can flow for long distances. Mount St. Helens has lava with a higher silica content, which results in a lower temperature and a higher viscosity, creating thick, blocky lavas when lava flows are generated.
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