Plate tectonics (from Greek τεκτων, tektōn "builder" or "carpenter") is a theory of geology developed to explain the phenomenon of continental drift, as one where the cooler and more solid surface parts of the Earth's rock crust ("plates") move slowly over time across the hotter, weaker, underlying asthenosphere.
The outermost part of the Earth's interior is made up of two layers: the lithosphere comprising the crust and the solidified uppermost part of the mantle. Below the lithosphere lies the asthenosphere which comprises the inner viscous part of the mantle. The mantle behaves like a superheated and extremely viscous liquid.
The lithosphere essentially floats on the asthenosphere. The lithosphere is broken up into what are called tectonic plates - in the case of Earth, there are ten major and many minor plates. These plates move in relation to one another at one of three types of plate boundaries: convergent, divergent, and transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries.
As noted above, the plates are able to move because of the relative weakness of the asthenosphere. Dissipation of heat from the mantle is acknowledged to be the source of energy driving plate tectonics. Three-dimensional imaging of the Earth's interior (seismic tomography), indicates that convection of some sort is occurring throughout the mantleTanimoto 2000. How this convection relates to the motion of the plates is a matter of ongoing study and discussion. Somehow, this energy must be translated to the lithosphere in order for tectonic plates to move. There are essentially two forces that could be accomplishing this: friction and gravity.
2006-07-16 02:27:55
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answer #1
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answered by Anonymous
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Tectonic movement is more commonly known as taking a dump.
When a person's lower intestines have been surgically replaced with modern technologically developed substitute tubes, the activity that was once called a "bowel movement" becomes a "tectonic movement."
I hope that you don't need this procedure and are just asking out of curiousity.
2006-07-16 06:07:02
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answer #2
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answered by Goethe 4
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Tectonic motion for points around the world can be estimated from a variety of space geodetic technologies (e.g., satellite laser ranging (SLR), Very Long Baseline Interferometry (VLBI), Global Positioning System (GPS) among others). In this web-page, the focus is on the results from SLR. With over 15 years of laser tracking data acquired by a network of globally distributed sites, variations in site positions can be monitored through time. The motions of the plates are largely slow and smooth in nature, with the exception of regions where earthquake activity is high. In these regions, significant surface displacements over a very short time period can and do occur. The results you will find here only represent the generally slow and smooth nature of tectonic motion - displacements directly attributable to earthquakes may not be evident in these results.
Below, you will find an index map for the regions of the world for which there are SLR site motion results. Unfortunately, for a variety of socio-economic and political reasons, the entire world is not uniformly covered by SLR observatories. If you're interested, you might try the links to VLBI and GPS to discover the parts of the world sampled by those technologies. For the SLR results, use the links below the map to view the SLR estimates of site motions for locations within these regions.
2006-07-16 05:25:00
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answer #3
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answered by fzaa3's lover 4
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Tectonic movement is the shifting and adjustment of the earth's continental plates which are basically floating on magma and collide with one another creating earthquakes and tsunamis and all kinds of other unpleasant phenomenons. This is a simple explanation, it's far more complex than just that.
2006-07-16 10:23:17
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answer #4
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answered by Joe E 4
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tectonic movement refers to the movement of plates of the earth.....go to www.howstuffworks.com
2006-07-16 05:14:14
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answer #5
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answered by Anonymous
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it's the movement of the plate present beneath the earth
2006-07-25 11:12:38
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answer #6
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answered by stylish 3
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Moving plates
2006-07-25 12:54:11
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answer #7
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answered by S. Leroy 3
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The movemet of th planetary crust
2006-07-20 16:15:44
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answer #8
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answered by Anonymous
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http://www.ucmp.berkeley.edu/geology/tectonics.html
I hope this site will be of some assistance and should point you in the direction of other useful sites.
2006-07-16 05:15:35
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answer #9
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answered by Anonymous
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