A) cavities or bubble-shaped holes formed in lavas or pyroclastics by escaping gases during quenching
B) empty pits where large crystals like phenocrysts weathered out during exposure
C) holes that used to be full of hot liquid water when the rocks erupted
D) the sex organs of fossilized creatures that once lived in the molten magma
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A) Plagioclase
B) Microcline
C) Orthoclase
D) Pyroxene
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A) plutonic
B) lava
C) extrusive
D) volcanic
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A) open voids in an igneous rock left when phenocrysts dissolved away
B) the larger mineral grains of a porphyritic texture
C) the fragments comprising a volcanic breccia
D) open spaces formed in the rock as the lava solidified around gas bubbles
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A) Intrusive magma is cooler because it is well insulated by the surrounding rock.
B) Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow.
C) The extrusive magma cools quickly so the mineral grains do not have time to grow.
D) The extrusive magma, because it is deep below the surface, cools very slowly producing very small mineral grains.
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A) carbon monoxide
B) methane
C) nitrous oxide
D) water
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A) aphanitic
B) glassy
C) phaneritic
D) porphyritic
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A) crowded and irregular in shape
B) small and clouded with inclusions of everything that formed later on
C) those that can form only at the lowest temperatures
D) larger and well formed because they have space to grow and a ready supply of ions
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