This evidence for continental drift gave geologists. Color the legend on the puzzle pieces handout according to the key. Introduction in 1915 wegener published a book the origin of continents and. The evidence for tectonic plate motion was radical in the early and midtwentieth century. Therefore, rationalist approaches suggest that evidence can be enough by itself to close scientific controversies. From this he began plotting worldwide distributions of both rock and. Some of the evidence supporting the continental drift of the tectonic plates include the presence of similar animals and plant fossils on the shores of various continents, which suggest that they were once joined. As stated before the theory of continental drift has strong points of evidence one being the physical feature, how all of the continents, for the most part, fit together like puzzle pieces for example, africa and south america. The students will be able to identify the evidence for continental drift and locate them on a map. This was the time when reptiles and winged insects first appeared. Pdf styles of thought on the continental drift debate. A teaching companion us geological survey, may 1999. To learn about the continental drift theory and the evidence that supports it.
Continental drift, paleomagnetism, and plate tectonics history continental drift continental drift alfred wegener 1915 he was the first strong proponent of continental drift he published the origin of continents and oceans he proposed that a supercontinent named pangaea pan all, gaea earth split into the present continents. Continental drift refers to the movement of the continents relative to each other. Evidence for continental drift adapted from this dynamic planet. Wegener and his theory of continental drift springerlink. In the early 1960s, the emergence of the theoryof plate tectonicsstarted a revolution in the earth sciences. Several types of evidence in rocks on land and on the seafloor and in the animal and plant kingdoms may be explained simply if we assume that the continents. We are taught that modern scientists are driven only by reason and facts. Tectonics, continental drift theory by alfred wegener, evidence and drawbacks of continental. Hundreds of millions of years ago, earth looked completely different.
You will be piecing together a puzzle of the supercontinent pangea based on fossil and rock evidence on the present day continents. These notes will also be useful for other competitive exams like banking po, ssc, state civil services exams and so on. This indicates that these continents had to be once joined together because the extensive oceans between these land masses act as a type of barrier for fossil. Continental drift theory states that the continents have not always been in their present locations but. Chapter 1 from continental drift to plate tectonics naomi oreskes since the l6th century, cartographers have noticed the jigsawpuzzle fit of the continental edges. In this article i analyse continental drift debates.
Continental drift this video describes the evidence alfred wegener used to. Alfred wegeners theory of continental drift upsc ias evidence and rejection of the theory during the second and third decades of the twentieth century, the notion of continental drift was revived, most notably by the german meteorologist and geophysicist alfred wegener. Ncert notes on important topics for the upsc civil services exam. On the puzzle pieces handout, assign a color to each type of fossil or mountain belt in. In 1915 wegener published a book the origin of continents and. Wegener said that continents move around on earths surface and that they were once joined together as a single supercontinent. Magnetic polarity evidence for continental drift discusses how the lack of a plausible mechanism kept wegeners colleagues from accepting his continental drift hypothesis. Continental drift, paleomagnetism, and plate tectonics. You will be piecing together a puzzle of the supercontinent pangaea based on fossil and rock evidence on the presentday continents. Through the theory of continental drift, humans have been able to figure out how the earths crust moves and the causes of volcanoes, earthquakes, oceanic trenches, formation of mountain ranges and other geological occurrences. Paleomagnetism and continental drift this old earth.
Seafloor spreading theory sfst seafloor spreading describes the movement of. This concept was an important precursor to the development of the theory of plate tectonics, which incorporates it. The coasts of the continents surrounding the atlantic ocean could, if the continents were moved closer, fit together like a jigsaw puzzle. Bookmark file pdf plates tectonics and continental drift answer key plates tectonics and continental drift answer key continental drift and plate tectonics continental drift and plate tectonics. Try to work out which of these pieces of evidence wegener might have used in the 1920s to support his.
Continental drift, largescale horizontal movement of continents relative to one another and to the ocean basins during one or more episodes of geologic time. Polar wandering similar to continental drift theory polar wandering is the relative movement of the earths crust and upper mantle with respect to the rotational poles of the earth. The speculation that continents might have drifted was first put forward by abraham ortelius in 1596. Magnetic polarity evidence for continental drift read. We now know that, directly or indirectly, plate tectonics influences nearly all. In some places, it slides under the continental crust and. Continental drift theory continental drift is the hypothesis that all the continents had once been joined together in a single landmass. As a meteorologist alfred wegener was well aware of some climatological puzzles, such as the remains of temperate climate trees that can be found under polar ice. In this lesson, students learn about the evidence for continental drift and about the process of science. In other words, the paleomagnetic evidence appears to. Set forth in 1912 by alfred wegener, a geophysicist and meteorologist, continental drift also. Subduction zone oceanic crust is heavier than continental crust. There are multiple lines of evidence for changes in the position of the continents over geologic.
The evidence which gave rise to the theory of continental drift more correctly called plate tectonics includes the following. Continental drift theory evidences and limitations. Fossils certain fossils preserved in rocks of the same age but from different continents. This article talks about the continental drift theory upsc. Theory of continental drift physical geography lumen learning. We have learned that rock samples containing magnetic. Mesosaurus small fresh water reptile glossopteris plant remains. On the puzzle pieces handout, assign a color to each type of fossil or mountain belt in the legend and color the areas on the landmasses according to the legend. In the early 1960s, the emergence of the theory of.
He then gathered an impressive amount of evidence to show that earths continents were once connected in a single supercontinent. You can enjoy this soft file pdf in any become old you expect. Fossils of a freshwater reptile known as mesosaurus was found both in south africa and brazil. The theory of continental drift was first proposed by alfred wegener in 1912. There are various examples of fossils found on separate continents and in no other regions. Continental drift wikipedia, the free encyclopedia. Fossils we gener learned that the fossils of an ancient reptile, mesosaurus mehzuhsawruhs, had been discovered in south america and western africa. Evidence of the continental drift essay example graduateway. Fossils wegener learned that the fossils of an ancient reptile, mesosaurus mehzuhsawruhs, had been discovered in south america and western africa.
What are six things that supported wegeners theory of continental drift. Wegener and his theory of continental drift indian academy of. Continental drift is the motion of the earths continents over geological time. More evidence that supported wegeners theory of continental drift climate clues o he found evidence of glaciers in tropical areas. Evidence for continental drift wegener gathered evidence for his hypothesis from fossils, from studies of ancient climate, and from the geology of continents. Pdf a historical account of how continental drift and plate tectonics. Use those same colors to color each type of fossil or mountain belt according to your legend. Paleomagnetism and the proof of continental drift more than 1,500 years ago, chinese sailors discovered that a piece of lodestone, when suspended from a thread, points in a northerly direction and can help guide a voyage.
The continental drift hypothesis was developed in the early part of the 20th century, mostly by alfred wegener. We now know that, directly or indirectly, plate tectonics influences nearly all geologic processes, past and present. Another important piece of evidence in the continental drift theory is the fossil relevance. Cut out each of the continents along the edge of the continental shelf the outermost dark line. A brief introduction to alfred wegeners theory of continental drift, which would lay the groundwork for the development of plate tectonic theory, which essentially explains the. The concept was independently and more fully developed by alfred wegener in 1912, but his theory was rejected by many for. Many in the scientific community of the day criticized it, yet today it is the accepted view by mainstream science. Continental drift is the theory that the earths continents have moved over geologic time relative to each other, thus appearing to have drifted across the ocean bed. Thus, proposed in 1912 by alfred wegener, continental drift theory explained why similar looking animal and plant fossils and. Willi hennig 1950 introduced the modern concepts of phylogenetic theory. It is thought that all the continents were once joined together in one supercontinent, named pangaea. Evidence for continental drift we gener gathered evidence for his hypothesis from fossils, from studies of ancient climate, and from the geology of continents.
Alfred wegeners theory of continental drift and evidence. Plate tectonics theres a continent called pangaea well, there once was. The continental drift hypothesis was developed in the early part of the 20 th century, mostly by alfred wegener. Continental drift is defined as the motion of the earths continents over a defined period of time. In 1912, alfred wegener proposed a theory that the continents had once been joined, and over time had drifted apart. Vocabulary word to know resource exploitation resource use sustainability land use native species introduced species. By the mid twentieth century enough evidence had been amassed to begin openning the minds of many scientists to the idea that the continents could have moved across the surface of the earth. Continental drift was a theory that explained how continents shift position on earths surface. Alfred wegener, pangea, and the evidence for continental. He had initially become fascinated by the nearperfect fit between the coastlines of africa and south america, and by the commonality among their geological features, fossils, and evidence of a glaciation having affected these two separate continents. Continental drift updated 2018 a brief overview of the theory of continental drift and the evidence supporting it.1349 258 106 427 860 490 773 765 538 458 1083 1594 675 1106 433 1392 208 157 1321 670 455 831 592 836 779 1040 209 1339 543 479 1542 1590 669 86 665 997 875 1236 43 1413 633