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Why is silica-rich magma explosive?

Why is silica-rich magma explosive?
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Why is silica-rich magma explosive?

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User Carlos Chourio
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silica is a rich compound that has silicon and oxygen and it's thicker and is more resistant to flow. other lava with less silica flows easier so the amount of water vapor and other gases trapped in lava influences how lava erupts. hope the helps!
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User Aram Paronikyan
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