SME
Grade 12 Science · Problem type
Low-silica or high-silica magma?
Use this for “Why do volcanoes above subduction zones erupt explosively?”
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Which magma does this describe?
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Assumptions
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Silica chains make magma thick; thick magma holds its gas until it bursts out.
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Basalt is low in silica, andesite is in between, and rhyolite is highest.
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Related lessons
Volcanoes, crustal deformation and mountain building
Main lesson
Folds and faults
Use this for “The hanging wall dropped down along the fault. Which kind of fault is it, and what stress made it?”
How plates build mountains
Use this for “Why are there volcanic mountains along a coast where an ocean plate sinks?” and “What happens as a rift valley widens?”