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True
False
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False
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Obsidian
Pumice
Tuff
Pegmatite
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Crystal size
Heat
Pressure
Volatiles
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True
False
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True
False
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Silica content
Texture
Mineral content
Bowen's reaction series
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The rock is crystalline; mineral grains are too small to be visible without a magnifying lens or microscope
The mineral grains have glassy textures.
The rock consists of broken, volcanic-rock and mineral fragments.
The rock is crystalline; mineral grains are of distinctly different sizes.
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True
False
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True
False
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True
False
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Porphyrocryst
Vesicle
Phenocryst
Xenocryst
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Biotite
Quartz
Olivine
Muscovite
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Aphanitic
Porphyritic
Phaneritic
Glassy
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Polished cubes
Broken chips
Thin sections
Grain karats
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True
False
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Felsic
Intermediate
Mafic
Ultramafic
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Heat
Pressure
Crystal size
Volatiles
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Basalt
Granite
Gabbro
Diorite
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Calcium-rich plagioclase feldspar
Pyroxene
Amphibole
Quartz
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Wet granite melts at a higher temperature than dry granite
Dry basalt melts at a higher temperature than dry granite
Basalt and wet granite melt at the same temperature
Whether granite is wet or dry has no effect on melting temperature
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Aphanitic
Porphyritic
Phaneritic
Glassy
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Granite
Gabbro
Basalt
Rhyolite
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Porphyritic
Phaneritic
Aphanitic
Glassy
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Peridotite
Rhyolite
Andesite
Granite
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Welded tuff sheets
Basaltic lavas
Granitic pegmatites
Diorite plutons
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Intrusive magma is cooler because it is well insulated by the surrounding rock.
Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow.
The extrusive magma cools quickly so the mineral grains do not have time to grow.
The extrusive magma, because it is deep below the surface, cools very slowly producing very small mineral grains
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Basalt
Andesite
Pegmatite
Peridotite
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Pumice
Grante
Pegmatite
Peridotite
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Olivine
Quartz
Orthosclase feldspar
Sodium-rich plagioclase feldspar
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Basaltic composition
Glassy texture
Ultramafic composition
Phaneritic texture
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Magma mixing
Partial melting
Differentiation
Assimilation
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Aphanitic
Porphyritic
Phaneritic
Glassy
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True
False
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Andesite
Rhyolite
Basalt
Gabbro
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Aphanitic
Porphyritic
Phaneritic
Glassy
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Olivine
Quartz
Orthoclase
Sodium-rich plagioclase
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Plagioclase
Microcline
Orthoclase
Pyroxene
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Rhyolitic tuff
Porphyritic basalt
Intrusive granite
Andesitic lava
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True
False
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Rhyolite and gabbro
Rhyolite and granite
Andesite and peridotite
Basalt and diorite
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Convergent plate boundaries
Mid-ocean ridges
Transform faults
Oceanic trenches
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Basalt dike; fills a vertical fracture at shallow depth
Pumice lump; crystallized at depth in a mass of intrusive granite
Peridotite; crystallized at depth in the upper mantle
Pegmatite; crystallized from a water-rich, highly differentiated, residual magma
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Ultramafic
Andesite
Basalt
Rhyolite
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True
False
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Obsidian
Pegmatite
Tuff
Pumice
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Glassy
Pyroclastic
Aphanitic
Phaneritic
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Phenocrysts
Vesicles
Pegmatites
Matrix or groundmass
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