What is obsidian? How does it form?
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Q48: The figure below shows mafic magma as
Q49: Briefly explain why and how magmas rise
Q50: Large igneous provinces are formed by _,which
Q51: List the four major magma compositions
Q52: Compare and contrast a dike and a
Q54: A felsic,highly-vesicular volcanic rock is termed
A) pumice.
B)
Q55: Fragments of material erupted from a volcano
Q56: A volcanic arc results from _ tectonic
Q57: What is a tuff? How does a
Q58: What is fractional crystallization? Briefly explain how
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