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| When clay minerals in a shale are subjected to elevated temperature and pressure, they may change in the solid state (that is, without melting) to form platy minerals like ___ that are at equilibrium with the new temperature/pressure conditions. |
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| _______ metamorphism occurs adjacent to a pluton when a body of magma intrudes a relatively cool country rock. |
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| ______ stress is a type of differential stress. |
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| The light-color layers within a typical gneiss are formed by __. |
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| ____ is the lowest-grade rock in progressive metamorphism. |
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| Because of the ease with which it can be split into thin flat sheets, this metamorphic rock is used for making chalkboard, pool tables, and roofs. |
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| The most important factors controlling the characters of metamorphic rocks include ___. |
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| A _______ is characterized by parallel-orientated minerals, commonly mica. |
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| ___ is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures. |
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| ___ metamorphism is the term used for the process in which rocks are altered by hot water. |
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| __________ forces the constituents of a rock to become parallel to one another. |
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| The zone of contact metamorphism (the aureole), ____. |
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| is commonly rather narrow, from 1 to 100 meters wide |
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| _____ are important economic resources for lead, zinc, gold, silver, tungsten, tin, and mercury. |
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| Metamorphism may involve all of the following except __. |
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| complete melting of the rock |
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| Metamorphic rocks are prevalent __. |
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| in intensely deformed portions of large mountain ranges, where the continental crust is subjected to high temperatures, pressures, and tectonic stress |
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| ___ tends to deform objects into oblong or flattened forms. |
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| ___ is pressure applied equally to all surfaces of a substance as a result of burial or submergence. |
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| Shock metamorphism can occur as a result of ______. |
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| The differential stress responsible for foliation can take place at _____. |
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| The two most common non-foliated metamorphic rocks are _______ and marble. |
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| ___ is a metamorphic rock with distinct light and dark layers that formed at high temperatures and pressures. |
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| When a rock is buried to increasing depth it is subject to increasingly greater temperature and pressure and will undergo _____. |
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| _______ is a very fine-grained metamorphic rock that splits easily along parallel planes. |
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| The deeper a rock is below the Earth's surface ______. |
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| The major ____ classification of metamorphic rocks divides them into foliated and non-foliated groups. |
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| _____ is metamorphism coupled with the introduction of ions (charged atoms) from an external source. |
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| _______ forms when a limestone recrystallizes during metamorphism. |
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| The most important factor in controlling the final metamorphic product is __. |
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| The composition of the pre-existing rock. |
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| ___ metamorphism takes place at considerable depth underground (generally greater than 5 km). |
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