Magmas formed at subduction zones are mostly intermediate or felsic.
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Q7: Mafic magma has lower viscosity.
Q8: Felsic lavas would tend to be slow
Q9: The magmas formed beneath spreading ridges are
Q10: Magma composition may change by crystal settling.
Q11: Partial melting explains the origin and composition
Q13: Phaneritic textures indicate that the rock formed
Q14: Porphyritic textures suggest a complex cooling and
Q15: Volcanoes always erupt magmas of the same
Q16: Pegmatites are composed of very large crystals
Q17: Rhyolite forms when a mafic magma cools
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