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| Fine-grained igneous rocks (grains less than 1.0 mm) that have small grains cooled rapidly and are likely to be ________. |
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| Both andesite and ___ are composed of feldspars and 30% to 50% ferromagnesian minerals. |
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| A ______ is an intrusive structure that formed within the "throat" of a volcano. |
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| The most common minerals in a granite are the _______. |
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| ______ is the predominant igneous rock of the continents. |
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| The melting point of a mineral generally _____ with increasing pressure (depth). |
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| The first plagioclase crystals to form as a hot melt cools are high in _______. |
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| Geologists regard basaltic magma (Hawaiian lava, for example) as the result of the partial melting of ultramafic rock in the _____. |
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