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Topic: Continental drift


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  Continental drift - EvoWiki   (Site not responding. Last check: 2007-11-02)
Continental drift is the theory that the Earth's crust is divided into plates that move relative to each other, with their interactions producing a variety of geological features.
This continual drifting has been described as "continental bumper cars", and some geologists theorize that the periodic accretion and fracturing of continental masses may be a necessary part of a geologic cycle.
The modern concept of continental drift was first proposed by German meteorologist Alfred Wegener; he pointed out the biogeographical details that Suess had pointed out, and he pointed out that Permian glaciers in the southern continents had flowed from oceans -- unless those continents had been united to form Gondwana back then.
wiki.cotch.net /index.php/Continental_Drift   (870 words)

  
 Continental drift - Wikipedia, the free encyclopedia
Continental drift, first proposed as a theory by Alfred Wegener in 1912, is the movement of the Earth's continents relative to each other.
The hypothesis of continental drift became part of the larger theory of plate tectonics.
Evidence for continental drift is now extensive, in the form of plant and animal fossils of the same age found around different continent shores, suggesting that these shores were once joined: the fossils of the freshwater crocodile, found in Brazil and South Africa, are one example.
en.wikipedia.org /wiki/Continental_drift   (1494 words)

  
 Continental Drift - MSN Encarta
Continental Drift, movement of continents relative to each other across the surface of the Earth.
Wegener is therefore often regarded as the originator of the continental drift theory.
This episode of continental drift is sometimes called “Wegenarian drift”, after the theory's originator.
uk.encarta.msn.com /encyclopedia_761555735/Continental_Drift.html   (882 words)

  
 Moving Continents: Images of Continental Drift
The phenomena is known as continental drift and the process has been going on for hundreds of millions of years-- at rates measured in only a few centimeters per year.
The Jurassic Period followed (213 million years ago) marked by the onset of sea floor spreading which caused a dramatic resurgence in continental drift, culminating in the gradual breakup of the supercontinent.
The study of continental drift, it's history and the forces that cause it, constitutes the branch of geology known as Plate Tectonics.
www.clearlight.com /~mhieb/WVFossils/continents.html   (614 words)

  
 Sunken continents vs. continental drift
One of the main props of continental drift is paleomagnetism -- the study of the magnetism of ancient rocks and sediments.
Lower Paleozoic continental rocks with trilobite fossils have been dredged from seamounts scattered over a large area northeast of the Azores, and the presence of continental cobbles suggests that the area concerned was a submerged continental zone.
The hypotheses of large-scale continental drift, seafloor spreading and subduction, and the relative youth of the oceanic crust are contradicted by a considerable volume of data.
ourworld.compuserve.com /homepages/dp5/sunken.htm   (9184 words)

  
 Plate Tectonics
Continental Drift, the theory that continents move slowly about the earth's surface, changing their positions relative to one another and to the poles of the earth.
The trenches may be filled as the advancing edge of the continental crust is thrust up to form mountains, and numerous earthquakes originate from the plane along which the oceanic crust is forced to slip under the continental crust.
Such a model of continental drift is confirmed by many lines of evidence in addition to those already mentioned.
www.platetectonics.com /article.asp?a=18&c=3   (1694 words)

  
 Metroactive Music | Continental
Continental had sent its CD to the duplication plant a few days earlier.
But then there are those such as me, fans of Continental who were barely Brent's acquaintances but nevertheless felt a confounded ache in their hearts upon hearing the news.
While Continental does use arcs of free-form sonic sculpting, its songs stand out for their artfully meandering midtempo melodies and a catchiness that's never hackneyed or cheesy.
www.metroactive.com /papers/metro/08.10.05/continental-0532.html   (718 words)

  
 Continental Drift & Plant Distribution
Prior to the theory of continental drift, the widely scattered distribution of present-day cycads in Australia, South Africa, Malaysia and the Americas was an enigma.
It is believed that continental drift has resulted in the present worldwide distribution of this ancient group of seed plants.
It is believed that continental drift (in part) has resulted in the present worldwide distribution of this ancient group of seed plants.
waynesword.palomar.edu /cntdrift.htm   (1145 words)

  
 Have the continents drifted? - ChristianAnswers.Net
A handful promoted the notion that the continents had moved (continental drift), but they were accused by the majority of indulging in pseudo-scientific fantasy.
Some creationists believe that continental drift occurred rapidly by some mechanism(s), not now operative, at the close of the Flood or as a separate post-Flood catastrophe (e.g., when Genesis 10:25 says that in Peleg's day the earth was divided, meaning, in their view, continental drift rather than the division at Babel).
However, the theory that slow continental drift has taken place for millions of years is considered, to many Christians, contrary to the clear teaching of Scripture.
www.christiananswers.net /q-aig/aig-c001.html   (3344 words)

  
 continental drift. The Columbia Encyclopedia, Sixth Edition. 2001-05
On the basis of geology, biology, climatology, and the alignment of the continental shelf rather than the coastline, he believed that during the late Paleozoic and early Mesozoic eras, about 275 to 175 million years ago, all the continents were united into a vast supercontinent, which he called Pangaea.
In 1928, Scottish geologist Arthur Holmes suggested that thermal convection in the mantle was the mechanism that drove the continental movements.
The theory of continental drift was not generally accepted, particularly by American geologists, until the 1950s and 60s, when a group of British geophysicists reported on magnetic studies of rocks from many places and from each major division of geologic time.
www.bartleby.com /65/co/contin-dr.html   (510 words)

  
 Continental Drift
Continental Drift, produced by a unique collaboration of geophysicist Scotese, filmmaker Paula Longendyke and the Human Arts Association, is an entertaining and provocative film created to introduce intermediate science students and the general public to the history of crustal evolution.
The concise history of continental movement is supplemented with basic concepts of plate tectonics, cleverly illustrated by actors in dramatic scenes, complete with sets and costumes.
Current evidence of continental drift is explained by three explorers who go on a humor-filled search for it.
www.gmpfilms.com /continentaldrift.html   (391 words)

  
 Articles / Impact / Continental Drift, Plate Tectonics, and the Bible - Institute for Creation Research
The handful of geologists who promoted the notion of continental drift were accused of indulging in pseudoscientific fancy.
The facts indicate that the separation of the continents, rifting of the ocean floor, and underthrusting of ocean trenches, were accomplished by rapid processes, not occurring today, initiated by a catastrophic mechanism.
Van Huene, Structure of the continental margin and tectonism at the eastern Aleutian Trench: Geol.
www.icr.org /index.php?module=articles&action=view&ID=78   (2201 words)

  
 continental drift — Infoplease.com
Continental Drift - A great deal of evidence confirms the theory that the continents of Earth, made mostly of...
Continental Drift and Plate-Tectonics Theory - According to the theory of continental drift, the world was made up of a single continent through...
Rooting for continental roots; the discovery that the old cores of continents are unusually thick is rifting traditional notions about......
www.infoplease.com /ce6/sci/A0813370.html   (603 words)

  
 Continental Drift
Currently, it is believed that the arrangement of continental landmasses significantly affects the ocean currents.
Since ocean circulation is involved in the transfer of heat around the Earth, so the wandering of landmasses over tens and hundreds of millions of years may influence climate changes over similar time scales.
Such long-term changes to ocean circulation as a result of continental drift may explain the gradual return to an ice-covered world during the last 40 million years.
www.ace.mmu.ac.uk /eae/Climate_Change/Older/Continental_Drift.html   (608 words)

  
 plate tectonics: history of an idea.
Another observation favoring continental drift was the presence of evidence for continental glaciation in the Pensylvanian period.
Wegener eventually proposed a mechanism for continental drift that focused on his assertion that the rotation of the earth created a centrifugal force towards the equator.
Wegener's inability to provide an adequate explanation of the forces responsible for continental drift and the prevailing belief that the earth was solid and immovable resulted in the scientific dismissal of his theories.
www.ucmp.berkeley.edu /geology/techist.html   (939 words)

  
 Continental Drift & Development of Plate Tectonics   (Site not responding. Last check: 2007-11-02)
Continental drift is the predecessor to plate tectonic theory
If the continental boundaries of Africa and South America are defined as the edge of the continental shelf, then the continents fit together even better than at the coastlines.
If the continental boundaries of North America, Europe, and South America are defined as the edge of the continental shelf, then those continents also fit together very well.
www.crc.losrios.edu /~jacksoh/lectures/continentaldrift.html   (959 words)

  
 Plate tectonics - Wikipedia, the free encyclopedia
The theory encompassed and superseded the older theory of continental drift from the first half of the 20th century and the concept of sea floor spreading developed during the 1960s.
Where a dense oceanic plate collides with a less-dense continental plate, the oceanic plate is typically thrust underneath because of the greater buoyancy of the continental lithosphere, forming a subduction zone.
The acceptance of the theories of continental drift and sea floor spreading (the two key elements of plate tectonics) may be compared to the Copernican revolution in astronomy (see Nicolaus Copernicus).
en.wikipedia.org /wiki/Plate_tectonics   (5858 words)

  
 91.06.05: The Great Continental Drift Mystery
Although much of this supporting evidence for continental drift was known and available for many years, the concept received little acceptance and in fact open derision, until researchers began to formulate explanations for the mechanisms of movement.
Fifty years after Wegener first proposed his theory of continental drift the science of plate tectonics finally came to the rescue of his intellectual honor and his life’s work was vindicated.
Using the continental drift maps and your data chart determine whether Glossopteris was adapted to a warm or cold climate.
www.yale.edu /ynhti/curriculum/units/1991/6/91.06.05.x.html   (7076 words)

  
 Historical perspective [This Dynamic Earth, USGS]
According to the continental drift theory, the supercontinent Pangaea began to break up about 225-200 million years ago, eventually fragmenting into the continents as we know them today.
In Wegener's mind, the drifting of continents after the break-up of Pangaea explained not only the matching fossil occurrences but also the evidence of dramatic climate changes on some continents.
For example, the discovery of fossils of tropical plants (in the form of coal deposits) in Antarctica led to the conclusion that this frozen land previously must have been situated closer to the equator, in a more temperate climate where lush, swampy vegetation could grow.
pubs.usgs.gov /publications/text/historical.html   (1240 words)

  
 continental drift
The theory was first proposed in 1912 by German meteorologist Alfred Wegener, but such vast continental movements could not be satisfactorily explained or even accepted by geologists until the 1960s.
The theory of continental drift gave way to the theory of plate tectonics.
Whereas Wegener proposed that continents pushed their way through underlying mantle and ocean floor, plate tectonics states that continents are just part of larger lithospheric plates (which include ocean crust as well) that move laterally over the Earth's surface.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0007107.html   (278 words)

  
 Continental Drift
Continental Drift is also one of the primary lines of reasoning by popular science publications and the "scientific establishment" (of believers) to promote an old earth.
Another piece of evidence to the continental drift puzzle is the existence of magnetic imprints in ocean bottom rocks on both sides of the Mid-Atlantic ridges.
In spite of what we have been told by the mass media and "science" publications, there is no strong evidence (much less proof) that the continents have been drifting apart for millions of years, and in fact, the evidence suggests that they split up quite rapidly.
www.earthage.org /continentaldrft/continental_drift.htm   (2345 words)

  
 Developing the theory [This Dynamic Earth, USGS]
Continental drift was hotly debated off and on for decades following Wegener's death before it was largely dismissed as being eccentric, preposterous, and improbable.
During the 20th century, improvements in seismic instrumentation and greater use of earthquake-recording instruments (seismographs) worldwide enabled scientists to learn that earthquakes tend to be concentrated in certain areas, most notably along the oceanic trenches and spreading ridges.
The recognition of such a connection helped confirm the seafloor-spreading hypothesis by pin-pointing the zones where Hess had predicted oceanic crust is being generated (along the ridges) and the zones where oceanic lithosphere sinks back into the mantle (beneath the trenches).
pubs.usgs.gov /publications/text/developing.html   (1866 words)

  
 Continental drift bibliography
Chatterjee, S., 1984, The drift of India: A conflict in plate tectonics: Memoirs of the Geological Society of France, v.
Meyerhoff, A. A., and Meyerhoff, H. A., 1972, Continental drift, IV: Journal of Geology, v.
Van Huene, R. E., 1972, Structure of the continental margin and tectonism at the eastern Aleutian Trench: Geological Society of America Bulletin, v.
www.talkorigins.org /origins/biblio/continental_drift.html   (537 words)

  
 Continental Drift and Tectonic Plates
The theory itself was developed during the late 1960s and has since almost universally been accepted by scientists and has revolutionized the Earth sciences (akin to the development of the periodic table for chemistry, the discovery of the genetic code for genetics, or evolution in biology).
Tectonic plates are comprised of two types of lithosphere: continental and oceanic lithospheres; for example, the African Plate includes the continent and parts of the floor of the Atlantic and Indian Oceans.
The continental spine of South America is dense with this type of volcano.
www.crystalinks.com /tectonicplates.html   (1448 words)

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