Chapter 2: Convection and tectonics

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Which of the following terms best characterizes upwelling in the asthenosphere?

Diffuse

What accounts for most tectonic plate motion?

forces at subduction zones

What features at the surface provide evidence of plumes?

Hot spots

What is the relationship between temperature and density?

In general, warmer materials are less dense, and colder materials are denser.

What is convection?

a cycle of moving material formed by the rise of less-dense material and the sinking of denser material

What is a plume?

a zone of upwelling material originating at the outer core-mantle boundary


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