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Crust

Holt Earth Science Chapter 9, Section 9.3

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A. Oceanic-Continental Convergence When a plate capped with continental crust converges with a slab of oceanic lithosphere, the buoyant continental block remains ?floating?; denser oceanic crust sinks into the mantle. When oceanic slab goes down about 100km, melting is triggered in the asthenosphere above it. This is because the ?wet? oceanic rock in a high-pressure place melts at a much lower temperature than ?dry? rock of the same material does. Sediments and oceanic crusts have lots of H2O, which is carried down much depth by a subducting plate. As the plate moves down, heat + pressure drive water from voids in the rock. At a depth of 100km, the wedge of rock is hot enough so that H2O from slab, when exposed, causes some melting.

Apes Ch 14 Test

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Chapter 14 GEOLOGY AND NONRENEWABLE MINERALS Multiple Choice Questions Core Case Study A common form of extracting gold from rock used in Australia and North America is power flushing cyanide heap leaching sulfuric acid leaching hydraulic scouring yellow-cake extraction Level: Moderate Answer: B 14-1 What Are the Earth?s Major Geological Processes and Hazards? The middle, partially melted zone of the interior of the earth is called the crust tectonic plate core mantle magma Level: Easy Answer: D Which part of the earth?s crust makes up 71% of the crust? oceanic crust asthenosphere lithosphere continental crust geosphere Level: Moderate Answer: A Large sections of the earth?s crust, called __________, move slowly on the mantle below them.
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