An ultramafic rock is composed almost entirely of quartz.
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Q15: Igneous rock names are based on grain
Q16: Partial melting of the lower continental crust
Q17: Mafic igneous rocks are silica-poor.
Q18: Diorite and andesite are composed of similar
Q19: The continuous branch in Bowen's Reaction Series
Q21: Ultramafic igneous rocks are composed almost entirely
Q22: Fine-grained igneous rocks (grains < 1.0 mm)
Q23: A useful tool illustrating the relationships among
Q24: _ is the predominant igneous rock of
Q25: Mineralogically and chemically equivalent rocks are _
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