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plate tectonics

noun, Geology
1.
a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past adjacent plates.
Origin
1965-1970
1965-70
Related forms
plate-tectonic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for plate tectonics
  • In between come explanations of geology and plate tectonics.
  • Only in the last few decades has the cornerstone theory of plate tectonics become fully understood and accepted.
  • Chu was probably not expecting to have to give an explanation of plate tectonics, but he soldiered on anyway.
  • Mountains and valleys emerge and disappear due to plate tectonics.
  • Those new species were spreading around the globe even as plate tectonics was starting to carry the continents apart.
  • Climate, volcanism, plate tectonics all played a key role in regulating the oxygen level during various time periods.
  • The planet does lose some heat through the processes that drive plate tectonics, especially at mid-ocean ridges.
  • plate tectonics was considered ridiculous by the entire scientific community.
  • To understand this, you need to know about plate tectonics.
  • The plates are always moving and interacting in a process called plate tectonics.
British Dictionary definitions for plate tectonics

plate tectonics

noun
1.
(functioning as sing) (geology) the study of the structure of the earth's crust and mantle with reference to the theory that the earth's lithosphere is divided into large rigid blocks (plates) that are floating on semifluid rock and are thus able to interact with each other at their boundaries, and to the associated theories of continental drift and seafloor spreading
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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plate tectonics in Science
plate tectonics  
In geology, a theory that the Earth's lithosphere (the crust and upper mantle) is divided into a number of large, platelike sections that move as distinct masses. The movement of the plates is believed to result from the presence of large convection cells in the Earth's mantle which allow the rigid plates to move over the relatively plastic asthenosphere. The theory of plate tectonics was developed in the 1960s in an effort to explain the jigsawlike pattern of the Earth's continents. See Note at fault, See more at tectonic boundary.

Our Living Language  : Although German physicist, meteorologist, and explorer Alfred Wegener proposed the theory of continental drift in 1912, suggesting that the continents were once joined as one large landmass, the explanation for the movement of such large landmasses into their current positions was not developed for several more decades. According to the theory of plate tectonics, which was proposed in the 1960s, the continents (and ocean floors) ride atop about a dozen semirigid plates—huge slabs of Earth's lithosphere—that are much larger than the continents themselves. The plates' constant movement is powered by huge convection currents of molten rock in Earth's mantle, thought by many geologists to be heated by the decay of radioactive elements deep within Earth. Although the plates move only a few inches per year, over the hundreds of millions of years of geological time, the continents are carried thousands of miles. Along their margins, the independently moving plates interact in three main ways. Where plates pull apart, new crust is formed. Where they collide, one plate is submerged beneath the other, and material from the bottom one returns to Earth's mantle. If the converging plates have land masses on them, the boundaries crumple, forming mountains. Plates also slide past each other, creating the faults that produce earthquakes. The six major plates are the Eurasian, American, African, Pacific, Indian, and Antarctic. See more at note at Wegener.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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plate tectonics in Culture
plate tectonics [(tek-ton-iks)]

In geology, a theory that explains the distribution of continents, earthquakes, volcanoes,, mountains and other geologic phenomena in terms of the formation, movement, and destruction of tectonic plates. These plates move in response to forces deep within the Earth. Because continents, such as North America, often ride piggy-back on plates, their movement is referred to as continental drift.

Note: Earthquakes and volcanoes tend to occur at the boundaries between plates: the San Andreas Fault is on such a boundary.
Note: New plate material is constantly created by the process of sea floor spreading, and old material is destroyed when two plates collide and one plate moves under the other.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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