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    Need help from the experts! how will I am going to answer this, Please explain.
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    (Original post by Gartley222)
    Rhyolite's higher rate of viscosity decrease means stronger, faster eruptions beneath earth's surface; hence taller volcano forms over time. As it's more viscous it doesn't take as long to solidify, so less spreading eitherside of the central vent. Converse applies to Basalt; thus a shallower, wider volcano.
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