Exam 14: Tectonism and Volcanism

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A structural downfold is known as a(n)____. ​

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D

What is the main factor that determines whether a volcanic eruption is explosive or effusive? How does that factor affect eruptions in this way? ​

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Viscosity is the main factor. Magma viscosity influences the explosiveness of a volcanic eruption through its effect on the dissolved gas content of the magma, which tries to escape the magma as the magma rises closer to the surface. Gases are not vented easily from more viscous magmas, allowing gas pressure to build. ​

Tectonic forces that pull parts of the crust away from each other are known as _______________ tectonic forces. ​

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tensional

A fault along which rocks move up or down is called a ____.

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Crustal folding is due to compressional tectonic forces. ​

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A(n)_______________ is a thin, horizontal sheet of igneous rock that solidified between rock layers within the Earth. ​

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The subsurface location where rock displacement and the resulting earthquake originate is the ____. ​

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Exogenic processes, which originate at Earth's surface, tend to increase relief. ​

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A cliff that results from movement along a fault is called a(n)_______________. ​

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Faulting occurs when compressional forces are applied to rocks that are ductile rather than brittle. ​

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Normal faults are ____. ​

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Why are plug dome volcanoes considered dangerous? ​

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Which type of volcano is composed of both lava flows and pyroclastic materials? ​

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Inclination is always measured ______. ​

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Moment magnitude measures ____. ​

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The strike of a rock is the angle it is inclined from the horizontal. ​

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Lower viscosity magmas will result in more explosive volcanic eruptions. ​

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Compressional tectonic forces may result in the formation of ____. ​

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A large depression left after a huge volcanic eruption is called a(n)_______________. ​

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Which type of volcano has the "classic volcano shape", with concave slopes that are gentle near the base and steep near the top? ​

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