Convection Currents

Convection Currents - Convection Currents Very slow...

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Very slow convection currents flow in this plastic layer, and these currents provide horizontal forces on the plates of the lithosphere much as convection in a pan of boiling water causes a piece of cork on the surface of the water to be pushed sideways (following figure). The plates of the lithosphere and convection in the aesthenosphere Of course, the timescale for convection in the pan is seconds and for plate tectonics is 10-100 million years, but the principles are similar. Thus, we see that differentiation is crucial to plate tectonics on the Earth, because it is responsible for producing an interior that can support tectonic motion. Evidence for Plate Tectonics The original conjectures concerning plate tectonics were based on circumstantial evidence like the shapes of continents being such that they would fit well if pushed together. Today, we have a much broader set of evidence in favor of the hypothesis. Indications of Tectonic Activity
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Convection Currents - Convection Currents Very slow...

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