All continents were once connected as one large landmass now called pangaea. Continental drift ppt plate tectonics mantle geology. The continental drift hypothesiscontinents have moved slowly to notetaking worksheet. Oreskes, naomi 2002, continental drift pdf, in munn, ted.
Midocean ridges are essentially submerged mountain chains that are characterised by a deep central rift valley. Students explore the basics of wegeners theory of continental drift. Continental drift theory alfred wegener proposed that parts of earths crust slowly drift atop a. Importantly, drift paths recorded by paleomagnetism culminate in the assembly of a supercontinent during the late paleozoic.
To summarise, the theory of continental drift was published by wegener in. Continental drift and plate tectonics slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Activity 1 resource l1 example of resource for activity 2 l2 continental drift worksheet. Pdf problems in accepting plate tectonics and subduction as a. Continental drift ppt free download as powerpoint presentation. Continental drift and plate tectonics free download as powerpoint presentation. In the early 20th century, geologists began to realize that the earths outer crust is not one solid piece like an eggs shell. Ppt continental drift and plate tectonics powerpoint. Plate tectonicscontinental drift and mountain building article pdf available in bulletin of volcanology 741. Most influential earth scientists were based in the northern hemisphere, whereas most of the conclusive data came from the southern hemisphere there were plausible alternative explanations to the distribution of fossils and glacial deposits the geophysisists could not think of a force strong. Continental drift section 1 plate tectonics underlined words and phrases are to be filled in by students on the a.
Alfred wegener from continental drift to plate tectonics a j saigeetha and ravinder kumar banyal keywords continental drift, plate tectonics. Then new evidence about earths structure led scientists to reconsider wegeners bold theory. A theory proposed by alfred wegner that said all continents were once joined 300 million years ago in a single land mass called pangaea. Enrol and complete the course for a free statement of participation or digital badge.
This open educational resource is free of charge, under a creative commons. A j saigeetha is currently working in csircmmacs, bangalore. Continental drift and mountain building is a terrific summary of stateoftheart plate tectonics science at 2011. Oct 31, 2008 continental drift and plate tectonics slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Continental drift is a theory first presented by abraham ortelius abraham ortels in 1596. Pdf alfred wegenerfrom continental drift to plate tectonics. The lithosphere is divided into moving segments that change. Subduction zone oceanic crust is heavier than continental crust. Continental drift theory continental drift is the hypothesis that all the continents had once been joined together in a single landmass. This is the name of the proposed supercontinent where all the earths continents were once joined together. Embed for hosted blogs and item download options download 1 file.
Continental trench, volcanic arc, subduction, lithosphere, asthenosphere. The plate tectonics theory is based on the continental drift theory in that it explains how the supercontinent drifted apart into several plates. New ocean crust is created along midocean ridges 4. In that case, the deeper processes set the context for environment, and environment is thus taken to mean regional aspects of the environment, such as average annual temperature and rainfall, seasonal regimes such as the monsoon, and perhaps average wind speed and. After a reading passage, there are nine multiple choice questions and a constructed response.
This is consistent with the previously considered evidence for continental drift and validates the hypotheses of wegener and du toit. Jun 20, 20 continental drift and plate tectonics are two theories explaining the geological evolution of the earth, specifically its crust. Sep 30, 2017 students explore the basics of wegeners theory of continental drift. Mar 17, 2016 in the early 20th century, geologists began to realize that the earths outer crust is not one solid piece like an eggs shell. Plate tectonics theory the upper most mantle, along with overlying crust, behaves as a strong, rigid layer. Ever since the first global maps were drawn following the great voyages of discovery of the 15th and 16th centuries, it has been realised that the coastline geography of the continents on either side of the atlantic ocean form a pattern that can be fitted back together. Continental drift pangea final pangea plate tectonics. Tectonic plates and continental drift animation mcgrawhill animations.
This was the time when reptiles and winged insects first appeared. The crust is broken up into giant tectonic plates that ride atop. Comparing the continental drift and plate tectonic theory in this readers theater, based on a talk show theme, alfred wegener and current scientists come to discusssing their theories of crustal movement. The concept was independently developed by german geologist alfred wegener in 1912. Plate tectonics and the continental drift theory by. The idea of continental drift has since been subsumed by the theory of plate tectonics, which. The pictures show continental drift theory from 225 million years to present. An insiders history of the modern theory of the earth on. Many evidences for continental drift are then shown in a series of slides. Continental drift theory alfred wegener proposed that. He also proposed a tectonic cycle the wilson cycle. Frisch and meschede and blakey answer all these questions and more through the presentation and explanation of the geodynamic processes upon which the theory of continental drift is based and which have led to the concept of plate tectonics. In view of the intended range and modest scope of the article, we have kept. What are characteristics of continental drift theory.
Tectonic plates and continental drift animation youtube. Plate tectonics, our major paradigm for how the earth works, was established in the 1960ies following decades of observational research that culminated in key. Theory of continental drift proposed by alfred wegener in 1912, but not widely accepted until seafloor spreading was discovered in 1960. Animation of sea floor spreading worldwide earthquake patterns help us know where the edges of plates are located the earths plates wegener 18801930 continental drift was wegeners theory that all continents had once been joined together in a. Continental drift is an archaic and misleading term that is no longer in use. At subduction zones subduction zones are where mountainbuilding orogeny. Bromley plate tectonic setting of applalaciancaledonian mineral deposits as indicated by newfoundland examples d. The youngest oceanic crust is at the ridge crest, and the oldest oceanic crust is at the continental margins. General article alfred wegener from continental drift. Tectonics during ww ii, it was discovered that the ocean floor had some unique relief features like ridges, trenches, seamounts, shoals etc. It explains that the continents drifted apart because of the constant interaction between the earths tectonic plates and the heat of the earths core. That continent eventually separated and drifted apart, forming into the seven continents we have today.
Alfred sings a song based on taylor swifts shake it off. Ridges and trenches gave insights into natural boundaries between various lithospheric plates tectonic plates. Strong influence of crustal evolution on ore deposition j. If you continue browsing the site, you agree to the use of cookies on this website. From the early history of the geological revolution to the latest in explanations of the rocky mountains, firsch et al. Plate tectonics continental drift from circa 1911 alfred wegener, after being influenced by a scientific paper he had come across that listed fossils of identical plants and animals found on opposite sides of the atlantic, began proposing a then most controversial theory which held that the continents of the earth had once been joined together but had drifted apart through a process that he.
The theory has caused a revolution in the way we think about the earth. Continental drift is shown and described red slide alfred wegener is mentioned and his proposals in 1915. Continental drift is the theory that the earths continents have moved over geologic time relative. Plate tectonics, theory dealing with the dynamics of earths outer shell that revolutionized earth sciences by providing a uniform context for understanding mountainbuilding processes, volcanoes, and earthquakes as well as the evolution of earths surface and reconstructing its past continents and oceans. These important discoveries led to the field of tectonics in geology. Continental drift and plate tectonics plate tectonics. The 1965 paper of bullard, everett and smith was a linking transition between the theories of continental drift and plate tectonics. An animation of plate tectonics is shown and plate tectonics is described red slide. Continental drift and plate tectonics powerpoint, notes. Her current interests include the crustal deformation and modeling, plate tectonics, and gps geodesy. According to the theory, earth has a rigid outer layer, known as the lithosphere, which is typically about 100 km 60 miles thick and overlies a plastic moldable, partially molten layer called the asthenosphere. How we know plate tectonics happens most earthquakes and volcanoes occur.
The lithosphere is broken up into seven very large continental and oceansized plates, six or seven mediumsized. Using the law of uniforitarianism and evidence of plate tectonics, explain how you know pangea once existed, and infer where continents will be located on our globe in the future. General article alfred wegener from continental drift to. Continental mergers triggered extinctions separation of continents caused the isolation and diversification of organisms millions of y ear s ago cenozo eurasia i c meso zoi c p a l e oz oic n o rt h a mer i ca africa south india america antarctica a us t r a l i a. This was a revolutionary idea lets make sure we understand this.
Continental drift and plate tectonics are two theories explaining the geological evolution of the earth, specifically its crust. Time scales of geology and tectonic motion hutton and hall studied geologic processes in siccar point, britain where a subhorizontal devonian. Choose from 500 different sets of plate tectonics science 4 1 drift flashcards on quizlet. Mineral deposits, continental drift, and plate tectonics. Difference between continental drift and plate tectonics. Geologic events, such as earthquakes and mountain building, result from movement of the plates. Never before has there been a powerpoint about continental drift and plate tectonics that is so straightforward and engaging, with dozens of original animations and illustrations, smooth transitions, and a healthy dose of humor scattered over 255 slides, your students are guaranteed to be engrossed. Tectonics is the scientific study of forces convection currents in the. Plate tectonics and continental drift infographic live. Most earthquakes and volcanoes occur along plate boundaries 3. Continental drift and plate tectonics a brief history what is continental drift.
You are allowed to download the video for nonprofit, educational use. This took a loooong time to make, but it was totally worth it. Continental drift, sea floor spreading and plate tectonics. Analysis of secular polar motion and continental drift,bull.
The concept of plate tectonics was formulated in the 1960s. The aim of this article is to briefly introduce the concept of plate tectonics and also to highlight the role that wegener played to advance it. Concerning the theory of plate tectonics, i am more knowledgeable than the average person on the street, but i am greatly humbled by the vast expanse of what plate tectonics involves and the depth of knowledge that geologist have attained. The term continental drift was coined to support the idea that the continents were floating around on a sea of magma, drifting about and crashing into each other. Studies on subduction initiation have been many and con. Continental drift plate tectonics jeopardy template. Since the development of the theory, geologists have had to reexamine almost every aspect of. Plate tectonics earths surface divided into many plates that move slowly over the surface and interact with each other their movements are driven from below internal heat and convection in the earth what is convection. Plate tectonics and the continental drift theory on vimeo. Plate tectonics plate tectonics is the unifying theory of geology and revolutionized geology cornerstone of earthsystem approach. Jun 07, 2017 tectonic plates and continental drift animation mcgrawhill animations.
Subduction zones are where mountainbuilding orogeny occurs 6. Continental drift and plate tectonics university of iceland. Proposed by german meteorologist alfred wegener in 1912 all continents were once. Continental drift, plate tectonics, earth core, plate boundaries. The first comprehensive theory of continental drift was suggested by the german meteorologist alfred wegener in 1912. Continental drift, sea floor spreading and plate tectonics plate tectonics is a theory developed in the late 1960s, to explain how the outer layers of the earth move and deform. According to the theory of continental drift, the world was made up of a single continent through most of geologic time. Learn plate tectonics continental drift questions with free interactive flashcards.
Tuzo wilson offered a fundamental reinterpretation of wegeners continental drift theory and became the first person to use the term plates to describe the division and pattern of relative movement between different regions of the earths surface i. Animation of sea floor spreading worldwide earthquake patterns help us know where the edges of plates are located the earths plates wegener 18801930 continental drift was wegeners theory that all continents had once been joined together in a single landmass and have drifted apart since. Plate tectonics continental drift from circa 1911 alfred wegener, after being influenced by a scientific paper he had come across that listed fossils of identical plants and animals found on opposite sides of the atlantic, began proposing a then most controversial theory which held that the continents of the earth had once been joined together but had drifted apart through a. Download fulltext pdf alfred wegenerfrom continental drift to plate tectonics article pdf available in resonance 106. Plate tectonics should be required reading for all people because we live on a very dynamic planet. Plate tectonics is the grand, unifying theory of earth sciences, combining the concepts of continental drift and seafloor spreading into one holistic theory that explains many of the major structural features of the earths surface. The secular variantion of longitudes and plate tectonic motion. For nearly half a century, from the 1920s to the 1960s, most scientists paid little attention to the idea of continental drift. In some places, it slides under the continental crust and melts into the. A free powerpoint ppt presentation displayed as a flash slide show on id. Plate tectonics continental drift and mountain building pdf. Learn plate tectonics science 4 1 drift with free interactive flashcards. It explains that the continents drifted apart because of the constant interaction between the earths tectonic plates and the heat of.
121 365 1311 1205 895 300 1189 342 1317 341 669 949 1271 804 51 442 819 675 165 1488 966 1112 335 1477 198 1465 479 927 93 163 64