21. Plate Tectonics: History Of An Idea. Explains the early observation of the similar coastlines and undersea continental shelves and how this led to the development of theory of a an ancient single land mass. Discusses early contributors to the field like Alfred Wegener. http://www.ucmp.berkeley.edu/geology/techist.html

Plate Tectonics : The Rocky History of an Idea Close examination of a globe often results in the observation that most of the continents seem to fit together like a puzzle: the west African coastline seems to snuggle nicely into the east coast of South America and the Caribbean sea; and a similar fit appears across the Pacific. The fit is even more striking when the submerged continental shelves are compared rather than the coastlines. In 1912 Alfred Wegener (1880-1930) noticed the same thing and proposed that the continents were once compressed into a single protocontinent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. He believed that Pangaea was intact until the late Carboniferous period, about 300 million years ago, when it began to break up and drift apart. However, Wegener's hypothesis lacked a geological mechanism to explain how the continents could drift across the earths surface as he proposed. Wegener's drift hypothesis also provided an alternate explanation for the formation of mountains (orogenesis). The theory being discussed during his time was the "Contraction theory" which suggested that the planet was once a molten ball and in the process of cooling the surface cracked and folded up on itself. The big problem with this idea was that all mountain ranges should be approximately the same age, and this was known not to be true. Wegener's explanation was that as the continents moved, the leading edge of the continent would encounter resistance and thus compress and fold upwards forming mountains near the leading edges of the drifting continents. The Sierra Nevada mountains on the Pacific coast of North America and the Andes on the coast of South America were cited. Wegener also suggested that India drifted northward into the asian continent thus forming the Himalayas.

22. 404 Error: Document Not Found plate tectonics The Mechanism. The main features of plate tectonics are All these observations indicate intense geological activity at the midoceanic http://www.ucmp.berkeley.edu/geology/tecmech.html&e=42

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23. The Journal Of Geology Devoted to research and theory in geophysics, geochemistry, sedimentology, geomorphology, petrology, plate tectonics, volcanology, structural geology, mineralogy, and planetary sciences. Electronic edition. http://www.journals.uchicago.edu/JG/home.html

[Editor: Alfred T. Anderson, Jr.] Browse a Sample Issue The Journal of Geology Electronic Edition Journal Description Information about Electronic Subscriptions Letter to Institutional Subscribers Registration Form Institutional Site License Letter, Registration Form, and Site License (PDF) Editorial Board Available Tables of Contents Information about the Data Depository Instructions for Contributors Preparation of Word and WordPerfect Manuscripts General Instructions Special Instructions for Tables Special Instructions for Math How to Subscribe to ... JG Order Single Articles or Back Issues Permission to Reprint Advertising Information and Rates List Rental Information ... Journals Division

24. NPS: Nature & Science » Page Not Found plate tectonics animations. These animations were originally produced for the USGeological Click here to go to the geology potpourri animation page. http://www2.nature.nps.gov/geology/usgsnps/animate/pltecan.html&e=42

Skip to Content National Park Service National Park Service U.S. Department of the Interior NPS Advanced Search Search A to Z Air Biology ... Skip to Content Page Not Found The page you are trying to find may be unknown, expired, or temporarily unavailable. The page may also have been renamed or assigned a different file extension. Please check the URL address again or use the searches on the left to find what you are looking for. You can also visit our main page at http://www.nature.nps.gov/. We apologize for any inconvenience this may cause. Feel free to Contact Us. Skip to Content Skip to navigation U.S. Department of the Interior ... Contact Us update on I http://www2.nature.nps.gov/error.cfm I Email: Webmaster

25. Plate Tectonics Wonderful animations of plate tectonics movement. Including gif, avi and mov formats. http://www.ucmp.berkeley.edu/geology/tectonics.html

Geology : Plate Tectonics The progress of the earth sciences and the advancement of technologies associated with the understanding of our planet during the 1940's and 50's have led geologists to develop a new way of looking at the world and how it works. This exhibit explains the history of our new understanding of the Earth and provides a brief overview of the theories behind it. To learn about the history behind Plate Tectonics follow this link. To learn about the mechanisms driving Plate Tectonics follow this link. Plate Tectonics animation (WARNING: These animated gifs, including the smallest files, load slowly) This animation of the last 750 million years is 1.04MB. This animation of the last 750 million years is 506KB. This animation of the last 750 million years is 261KB. This animation runs the last 750 million years backwards (1.04MB). This animation is the same as above but only 506KB. This animation runs from 750 million years to the beginning of the Cambrian (294KB). This animation is a smaller version of the one above (166KB). This animation runs through the Paleozoic (532KB).

26. NPS: Nature & Science » Page Not Found US Geological Survey and National Park Service virtual geology site. The storyof plate tectonics really starts deep within the Earth, so lets take a http://www2.nature.nps.gov/geology/usgsnps/pltec/pltec1.html&e=42

Skip to Content National Park Service National Park Service U.S. Department of the Interior NPS Advanced Search Search A to Z Air Biology ... Skip to Content Page Not Found The page you are trying to find may be unknown, expired, or temporarily unavailable. The page may also have been renamed or assigned a different file extension. Please check the URL address again or use the searches on the left to find what you are looking for. You can also visit our main page at http://www.nature.nps.gov/. We apologize for any inconvenience this may cause. Feel free to Contact Us. Skip to Content Skip to navigation U.S. Department of the Interior ... Contact Us update on I http://www2.nature.nps.gov/error.cfm I Email: Webmaster

27. PLATE TECTONICS - Paleontology And Geology Glossary plate tectonics Dinosaur glossary explains basic paleontological terms. http://www.enchantedlearning.com/subjects/dinosaurs/glossary/PlateTectonics.shtm

EnchantedLearning.com is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Click here to learn more. (Already a member? Click here. ZoomDinosaurs.com Dinosaur and Paleontology Dictionary A B C D ... Z Click on an underlined word for more information on that subject. If the dinosaur or paleontology term you are looking for is not in the dictionary, please e-mail us PLATE TECTONICS Plate tectonics is a theory that explains how the Earth's continents float slowly on the surface, changing both their position and size over time. The theory was proposed by Alfred Wegener in 1912, but wasn't widely accepted until the 1960's. The theory argues that the Earth's crust (the lithosphere) is broken up into about 10 plates. These plates float on the Earth's upper mantle, which is a partially-molten layer. Major geologic activity occurs at the edges of these plates where they push into one another, pull farther apart, or move sideways with tremendous power. At these rims there are earthquakes, mountain building, and/or volcanic activity. Under the sea (where the Earth's crust is relatively thin but dense) and the plates are moving away from one another, new crust is formed at spreading ridges as lava flows from the upper mantle. This process is called sea-floor spreading, and increases the size of plates. When the rims of the thin, undersea tectonic plates come toward one another, one edge goes under the other (is subducted). This is a subduction zone, where plates get smaller.

28. WebDoGS Plate Tectonics Reconstruction Page A collection of web goodies on plate tectonics reconstructions; links, Caribbean geology Series of plate reconstructions for the Caribbean from 200 Ma http://www.uky.edu/ArtsSciences/Geology/webdogs/plates/reconstructions.html&e=42

29. A Science Odyssey You Try It Plate Tectonics egg with cracked shell Go directly to plate tectonics activity It representsa scientific revolution as significant to geology as relativity was to http://www.pbs.org/wgbh/aso/tryit/tectonics/&e=42

30. Plate Tectonics&e=42 - Wikipedia, The Free Encyclopedia plate tectonic theory arose out of two separate geological observations Before acceptance of plate tectonics, geology in particular was trapped in a http://en.wikipedia.org/wiki/Plate_tectonics&e=42

From Wikipedia, the free encyclopedia. Wikipedia does not have an article with this exact name. in other articles. in Wiktionary, our sister dictionary project. in the Commons, our repository for free images, music, sound, and video. Look for pages linking to this page If you have created this page in the past few minutes and it has not yet appeared, it may not be visible due to a delay in updating the database. Try purge , otherwise please wait and check again later before attempting to recreate the page. If you created an article under this title previously, it may have been deleted. See candidates for speedy deletion for possible reasons. Retrieved from " http://en.wikipedia.org/wiki/Plate_tectonics%26e%3D42 Views Article Discussion Edit this page Personal tools Create account / log in Navigation Main Page Community portal Current events Recent changes ... Donations Search Toolbox What links here Related changes Upload file Special pages ... About Wikipedia

31. Physical Geology - Plate Tectonics plate tectonics from the United States Geological Survey. Convergent Boundaries Hot Spots plates plate tectonics Ring of Fire . http://www.uh.edu/~jbutler/physical/chapter20.html&e=42

32. Earth Quakes Earthquakes, plate tectonics and Structural geology Resources. Academic Coursesand Field Trips. Courses With WWW Internetbased Resources http://www.uh.edu/~jbutler/anon/quakes.htm&e=42

33. Earth Floor Plate Tectonics The theory of plate tectonics has done for geology what Charles Darwin s theoryof evolution did for biology. It provides geology with a comprehensive http://www.cotf.edu/ete/modules/msese/earthsysflr/plates1.html&e=42

34. About Geology -- The Complete Guide To Earth Science A simple starting point for the basics of plate tectonics. geology and Society History of geology Wild Earth Theories plate tectonics in a Nutshell http://geology.about.com/library/bl/blnutshell_plate-tec.htm&e=42

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Homework Help Geology Homework Help ... Help w(' ');zau(256,140,140,'el','http://z.about.com/0/ip/417/C.htm','');w(xb+xb+' ');zau(256,140,140,'von','http://z.about.com/0/ip/496/7.htm','');w(xb+xb); FREE Newsletter Sign Up Now for the Geology newsletter! See Online Courses Search Geology From Andrew Alden Your Guide to Geology FREE Newsletter. Sign Up Now! Which Colors Are Yours? Mine are the set on the left; they are the official colors for geologic maps in the U.S. Geological Survey standard. The USGS colors are used on most American geologic maps, and I appreciate the intuitive connection between color and age (young at the top, coarse time units on the left). The other set is the International standard , used by European countries. I hate to think of the Triassic basins of New Jersey and Connecticut shown in that ghastly purple, or west Texas' Permian Basin in the eye-aching scarlet beneath it, but in Europe they have their reasons. For me, the Cambrian will always be orange. See both color sets listed in the Maps category. Friday September 23, 2005

35. Plate Tectonics And Deep Earth You are here. About Homework Help geology tectonics Deep Earth See ifyou can answer these 12 questions on plate tectonics. http://geology.about.com/od/tectonicsdeepearth/&e=42

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Homework Help Geology Homework Help ... Help w(' ');zau(256,140,140,'el','http://z.about.com/0/ip/417/C.htm','');w(xb+xb+' ');zau(256,140,140,'von','http://z.about.com/0/ip/496/7.htm','');w(xb+xb); FREE Newsletter Sign Up Now for the Geology newsletter! See Online Courses Search Geology Plate Tectonics and Deep Earth Alphabetical Recent Plate Tectonics in a Nutshell A tree of branching pages takes you through this great unifying theory. For more, see the Plate Tectonics category Geo-Quiz 16: Plate Tectonics See if you can answer these 12 questions on plate tectonics. Caution: this has been known to stump professors. Powering the Planet A hundred years ago the secret of Earth's eternal youth was discovered: radioactive heating. Into the Mantle A seven-part series introduces the thick rock shell making up the bulk of the Earth. For more, see the Earth's Mantle category. To the Core A two-part review of Earth's iron heart. For more, see the Earth's Core category. More Categories Plate Tectonics (23) The Earth's Mantle (12) The Earth's Core (5) more from your guide Divisions in the Earth's Interior A clear, annotated diagram of the Earth's cross section, from the "Views of the Solar System" site.

36. Plate Tectonics Geological Aspects plate tectonics Geological Aspects. Prof. J. TARNEY plate tectonics Thisworks as a result of hot mantle asthenosphere ascending beneath midocean http://www.le.ac.uk/geology/art/gl209/&e=42

37. Plate Tectonics Geological Aspects plate tectonics Geological Aspects. http://www.le.ac.uk/geology/art/gl209/lecture1.html&e=42

38. Continental Drift And Plate-Tectonics Theory The plate tectonic revolution. (geology).( Upheaval from the Abyss and platetectonics ) (American Scientist). Rooting for continental roots; http://www.infoplease.com/ipa/A0001765.html&e=42

in All Infoplease Almanacs Biographies Dictionary Encyclopedia Daily Almanac for Sep 25, 2005 Skip Navigation Home Almanacs ... Word of the Day Editor's Favorites Hispanic Heritage Month Hurricane Katrina Daylight Saving Time Ramadan ... Texas Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map College Center Scholarship Search College Resources Career Center Job Search Post Your Resume Continuing Ed. more . . . Search: Infoplease Info search tips Search: Biographies Bio search tips World Geography World Geography Continental Drift and Plate-Tectonics Theory Source: U.S. Dept. of the Interior, Geological Survey According to the theory of continental drift , the world was made up of a single continent through most of geologic time. That continent eventually separated and drifted apart, forming into the seven continents we have today. The first comprehensive theory of continental drift was suggested by the German meteorologist Alfred Wegener According to the generally accepted plate-tectonics theory , scientists believe that Earth's surface is broken into a number of shifting slabs or plates, which average about 50 miles in thickness. These plates move relative to one another above a hotter, deeper, more mobile zone at average rates as great as a few inches per year. Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called plate-boundary volcanoes. The peripheral areas of the Pacific Ocean Basin, containing the boundaries of several plates, are dotted with many active volcanoes that form the so-called Ring of Fire. The Ring provides excellent examples of plate-boundary volcanoes, including Mount St. Helens.

39. Geology Plate Tectonics Volcanoes The geology of Japan plate tectonics and Volcanoes. Lecture Outline. Basic platetectonics. To understand the geology of Japan, it is necessary to http://www.seinan-gu.ac.jp/~djohnson/natural/geology.html&e=42

40. Information On Plate Tectonics THIS DYNAMIC EARTH THE STORY OF plate tectonics Gives a detailed account of thedevelopment of the plate tectonics theory, and it describes the ways in http://geology.er.usgs.gov/eastern/tectonic.html&e=42

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