plate tectonics


  • WordNet 3.6
    • n plate tectonics the branch of geology studying the folding and faulting of the earth's crust
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Webster's Revised Unabridged Dictionary
    • plate tectonics a geological theory which considers the earth's crust as divided into a number of large relatively rigid plates, which move relatively independently on the more plastic asthenosphere under the influence of magmatic upwellings, so as to drift apart, slide past, or collide with each other, causing the formation, breakup, or merging of continents, and causing volcanism, the building of mountain ranges, and the subduction of one plate beneath another. In recent decades a large body of data have accumulated to support the theory and provide some details of the mechanisms at work. One set of supporting observations consists of data showing that the continents have slowly moved relative to each other over long periods of time, a phenomenon called continental drift. Africa and South America, for example, have apparently moved apart from a connected configuration at about 2 to 3 cm per year over tens of millions of years.
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In news:

He studied plate tectonics and how that affected the aquifer 's development.
The documentary, " Geology of California, 4,500,000,000 years in the making," looks at the history of California's geology , as well as demonstrating how certain forces, such as tectonic plates, work to shape the state.
The tectonic plates of the financial system continue to shift daily, leaving even the most astute economists scratching their heads.
It's no surprise that California, home to the boundary between the Pacific and the North American tectonic plates, should experience earthquakes with disturbing frequency as the two plates lurch past each other.
Rock Matt Carney Well, yeah — the song ends with tectonic plate-splitting crashes of pre-punk circa 1976.
(CBS News) A new study suggests that two recent earthquakes may indicate a literal seismic shift in our understanding of tectonic plate movements.
Meetings of Two Tectonic Plates.
Kardashian divorce triggers seismic shift in society's tectonic plates.
' Tectonic Plates' and the ROI of Health Benefit Programs.
CANCELLED Fundamentals of Wrench Tectonics Applied to the Anatolian Plate.
And the coastal infrastructure is still prone to subsequent earthquakes , with tectonic plates off the northeastern coast still potentially under strain.
The most famous of the " faults " that are responsible for California's earthquakes is the San Andreas—which, from the perspective of plate tectonics, is not just any fault but the boundary between two great plates.
You Try It: Plate Tectonics.
Here's a great interactive from PBS' A Science Odyssey that lets you manipulate tectonic plates.
Every so often, the tectonic plates of mainstream musical taste shift.

In science:

Plate tectonics is a relatively new theory that has revolutionized the way geologists think about the Earth.
On the Quantum Aspects of Geophysics
Since the mid-1960s, the plate tectonic theory has been rigorously and successfully tested.
On the Quantum Aspects of Geophysics
They are created by tectonic plates pushing against each other.
On the Quantum Aspects of Geophysics
We also believe that plate tectonic activity is necessary to sequester and recycle CO2. We do not know, however, the precise boundary of the habitable zone, in terms of semi-major axis, eccentricity, albedo, obliquity, and greenhouse effect; therefore the range of semi-major axis space to be searched is uncertain.
Coronographic Methods for the Detection of Terrestrial Planets
When present in convection cells, particles of these minerals will be carried along, be thermally cycled and may function as SHE. Examples of convection cells in geology are the convection currents in volcanic hot springs and the convection currents in the Earth’s mantle that drive plate tectonics .
Sorption heat engines: simple inanimate negative entropy generators
Also, as shown in reference, one must have α < 0.25 to mimic the dynamic of a real earthquake (some ‘energy’ or ‘strength’ is always lost to the upper moving tectonic plate).
Self-Organized Criticality in the Olami-Feder-Christensen model
For instance, in earthquakes, the drive is the slow tectonic movement of continental plates, which occurs over a timescale of centuries, while the actual stress relaxation occurs in quakes, whose duration is only a few seconds.
Sandpile Models of Self-Organized Criticality
Fast enough rotation keeps the day/night temperature difference within reasonable limits and the presence of a liquid core is necessary, although not sufficient, to have plate tectonics to work (Bostrom 2000).
Motivation and possibilities of affordable low-frequency radio interferometry in space
Plate tectonics is, on the other hand, probably required to recycle carbon back into the mantle and thus prevent a runaway CO2 greenhouse effect that would turn the planet inhabitable (Gonzales et al. 2001, Franck et al., 1999, 2000).
Motivation and possibilities of affordable low-frequency radio interferometry in space
Try to answer the question, “What’s wrong with plate tectonics theory?” and you begin to get down to the basics of real science.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?
This might appear to be convincing evidence of plate tectonics theory.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?
But does that mean plate tectonics theory is totally correct? Not necessarily.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?
If the Earth is not getting any larger, then what is happening to all that seafloor that is plunging downward? According to plate tectonics theory, the Earth’s mantle is convecting, turning over and over in an endless loop.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?
Decompression Dynamics, which unifies certain elements of plate tectonics with certain elements of Earth expansion.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?
In a just a few pages, I have covered more than a century of geodynamic ideas, reviewed what is wrong with plate tectonics theory and with Earth expansion theory, and I have described my new Whole-Earth Decompression Dynamics Theory, which unifies the two previous, dominant theories in a self-consistent manner.
Teaching Earth Dynamics: What's Wrong with Plate Tectonics Theory?