Exam 3: Plate Tectonics: a Unifying Theory

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What term refers to an episode of mountain building involving deformation-usually accompanied by igneous activity, metamorphism, and crustal thickening?

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In a(n) ____________________ plate boundary, lithosphere is neither created nor destroyed.

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transform

Using examples, discuss the evidence supporting the continental drift hypothesis.

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The student should discuss the evidence, including continent shapes, rock types, paleontology, glaciology, and remnant magnetism. Examples may include Glossopteris , magnetic stripes on the seafloor, glacial striations, age of seafloor, etc.

Magma that is formed at subduction zones by partial melting in the descending plate commonly has a(n) ____ composition.

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Because tectonic plates move in response to mantle convection, each plate moves at the same rate.

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Faunal and floral diversity decrease when continents break up, and increase when continents join together in larger landmasses.

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Both divergent and transform plate boundaries exist at mid-ocean ridges.

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Hot spots move with continental plates.

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In analyzing continental drift, the name given to the northern supercontinent was ____.

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Earth's magnetic poles coincide with the geographic (rotational) poles.

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A localized zone of melting (commonly thought to be stationary) below the lithosphere is called a(n) ____.

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Magnetism results from the spin of electrons in some solids.

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Climatic and geographic barriers provide boundaries for ___________________, which are regions with a distinct assemblage of plants and animals.

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What are terranes, and what information do they provide?

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Why are many petroleum and mineral deposits found at ancient convergent boundaries?

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Which statement about the properties of Earth's crust is true at subduction zones?

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Compare and contrast the three types of convergent plate boundaries: oceanic-oceanic, continental-continental, and oceanic-continental. Detail the geologic processes occurring at each and identify by location the geologic features that form.

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The oldest oceanic crust is slightly less than ____ years old.

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Explain the process of convection as it occurs on Earth , and include a diagram of a convection cell. Make sure your drawing shows Earth's core, mantle, crust, a spreading ridge, and a trench.

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The East African Rift Valley illustrates the formation of divergent plate boundary in a continental setting. Explain the four steps in the formation of a divergent plate boundary.

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