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Structure of the Earth

Holt Earth Science Chapter 9, Section 9.5

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What Drives Plate Motions? Convection (hot rocks rise and cold rocks sink) is the ultimate driver of plate tectonics A. Forces that Drive Plate Motion The mantle consists of almost entirely solid rock, but is hot and weak enough to act like a viscous, fluid-like convective flow. The simplest type of convection is like heating a pot of water. The base, which has been heated up, becomes less dense and rises in thin sheets/blobs that spread out to the surface. As the surface cools, it densifies and the cooler water sinks back to the bottom, where it reheats, etc. This is like mantle convection. Slab pull happens when cold, dense oceanic lithosphere sinks through the less dense underlying warm asthenosphere (sink down like a rock pulled into mantle by gravity).

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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