ch11 geol 100 – Flashcards
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How can we tell that the Himalaya have been uplifted?
answer
a. uplift can be measured with a global positioning system (GPS)
b. deep rocks are exposed at the surface and yield young isotopic ages
c. the top of Mount Everest contains a limestone with marine fossils
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What could cause a region to be higher in elevation than an average part of a continent?
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less dense continental crust
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Which of the following is NOT a setting in which regional mountain belts form?
answer
passive margin
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Which of the following occurs when mountain belts are eroded?
answer
a.erosion is accompanied by isostatic rebound
b. the continental crust becomes thinner
c. deep metamorphic and plutonic rocks can be uplifted to the surface
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what are ways in which local mountains can be built?
answer
prolonged volcanism in composite volcanoes
thrust faulting
normal faulting
folding
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The basin shown in this figure was actively subsiding during the formation of unit:
answer
C
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Which of the following processes forms basins in an ocean-continent convergent boundary?
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a. flexing and bending of the oceanic plate into the subduction zone
b. flexing of the continent by weight of the thrust sheets
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What can occur during the evolution of a hot spot?
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formation of rifts that radiate out from the hot spot
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What is the main reason why the age of oldest rocks can vary from one part of a continent to another?
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parts of the continent have been added by the accretion of tectonic terranes
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Seafloor spreading rates cannot be used to reconstruct past continents' positions older than 180 million years. Why?
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oceanic crust older than 180 million years has been subducted and the record destroyed
