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Volcanoes (definition (magma? (often less dense than the surrounding rock,…
Volcanoes
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magma compostions
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felsic magma--high feldspar and silica (usually relatively cool T; high silicate content; very high viscosity)
mafic magma (high T, lower silicate content; low viscosity)
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types
shield
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little danger, mild eruptions
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volcanic products
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gases
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but also SO2, H2s, HCl, and others
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