plate tectonics

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plate tectonics

n.
1. (used with a sing. verb) A theory that explains the global distribution of geological phenomena such as seismicity, volcanism, continental drift, and mountain building in terms of the formation, destruction, movement, and interaction of the earth's lithospheric plates.
2. (used with a sing. or pl. verb) The dynamics of plate movement.

plate′-tec·ton′ic adj.

plate tectonics

n
(Geological Science) (functioning as singular) 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

plate′ tecton′ics


n.
a geologic theory that describes the earth's crust as divided into a number of rigid plates, movement of which accounts for such phenomena as continental drift and the distribution of earthquakes.
[1965–70]
plate′-tecton′ic, adj.

plate tectonics

In geology, a theory that the Earth's lithosphere (crust and upper mantle) is divided into a number of large, plate-like sections that move as distinct masses. See Notes at fault, Gondwanaland, See more at tectonic boundary.
Did You Know? Have you ever noticed that the Earth's continents seem to fit together like pieces of a puzzle? This observation is what led the German meteorologist Alfred Wegener to propose the theory of continental drift in 1915. Since rocks and fossils were found to match up in parts of different continents, it seemed that they must have once been joined, but no one could explain how such large landmasses could move so far apart. This problem was not solved until the 1960s, when the theory of plate tectonics was proposed. According to this theory, the continents move apart by riding piggyback on plates—huge slabs of the Earth's lithosphere—that are much larger than the continents themselves. The plates move like parts of a conveyor belt powered by huge convection currents of molten rock that many geologists believe is heated by the decay of radioactive elements deep within the Earth. Although they only move a few inches per year, over hundreds of millions of years the continents are carried thousands of miles. Along their boundaries, the plates crumple, scrape, or pull apart from one another, giving rise to volcanoes and earthquakes and creating and destroying rock on the ever-changing surface of the planet.

plate tectonics


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The study of how lithospheric plates move around.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.plate tectonics - the branch of geology studying the folding and faulting of the earth's crust
geomorphology, morphology - the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms
Pangaea, Pangea - (plate tectonics) a hypothetical continent including all the landmass of the earth prior to the Triassic period when it split into Laurasia and Gondwanaland
References in periodicals archive ?
During this two-day period, 100 students and their teachers will hike through the park learning about geology as they observe faulted and folded rock created by plate tectonic events.
Stevens further explained that this led them to discover a previously unknown interaction between plate tectonic movements in America and dramatic changes in global temperature and the intensified monsoons created a positive feedback cycle, promoting more global cooling, more sea ice and even stronger precipitation, culminating in the spread of huge glaciers across the Northern Hemisphere.
Plate tectonic theory says the Earth's crust is made up of about a dozen major plates that rest on hot mantle.
These places represent Australia through pre-Rodinian and Proterozoic plate tectonic processes, Devonian periods and mass extinction events.
The Dreki Area is a part of the Jan Mayen Ridge micro-continent, which was separated from the continental shelf of Greenland and Norway by plate tectonic movements 45-60 million years ago.
One of the most interesting aspects of Canadian geology is the plate tectonic history, in which events on one margin of the continent are matched by contemporaneous, but different, types of event on another margin.
This intercontinental telescope network has been used to measure the movement of the continents--continental drift, or plate tectonic motion--with ever greater precision.
PALEOBIOGEOGRAPHICAL AND PLATE TECTONIC SIGNIFICANCE OF LATE CRETACEOUS OSTRACODES (CRUSTACEANS) FROM CHIAPAS, MEXICO: A PRELIMINARY REPORT.
The second chapter covers the physiographic features of ocean basins and the seafloor, tied to their plate tectonic origins.
Professor Bob Holdsworth, head of Earth sciences at the University of Durham, said: "The location of the earthquake lies along the Apennine backbone of Italy, a region where recently created mountains are now slowly collapsing due to a complex large-scale interaction between plate tectonic forces and gravity.
The Dreki area is part of the Jan Mayen Ridge micro-continent, which was separated from the continental shelf of Greenland and Norway by plate tectonic movements 45-60 million years ago.
Chester, a world-renowned expert, explains all three phenomena using plate tectonic theory, and he also relates how scientists developed this theory over time.