Magnetism in rocks can also be used as evidence for the continental drift. Today, the theory of continental drift has been replaced by the science of plate tectonics. What evidence supports the continental drift theory? The geomorphology textbooks focusses on the detailed processes which takes places in the weathering of rocks and the transport of debris as landforms are created and destroyed. How is plate tectonics supported by the apparent fit of the continental coastline? Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Another evidence that supports the theory of continental drift is Paeomagnetism. The following are the evidence of continental drift theory: The Matching of Continents: The shorelines of Africa and South America facing each other have a remarkable and unmistakable match. The poster child of scientific theory. He discovered glacier groves in continents that were not cold enough to support snow formation in the present day. After Pangaea split up, Wegner believed it formed the continents of Gondwanaland and Laurasia about 200,000 years ago before continuing to split apart to form the continents we know today. Indications of widespread glaciation from 380 to 250 million years ago are evident in Antarctica, southern South America, southern Africa, India, and Australia. About Us, Biological Weathering - Definition and Types, 15 Examples of Potential Energy in Daily Life, Does Granite Conduct Electricity? Answer 5: Fossils are formed when living organisms (plants or animals) die and become buried in dirt, sand or mud. The northern continent consists of Europe, North America, and Asia. They write new content and verify and edit content received from contributors. What is the five evidence of continental drift? Rodinia lasted around 500 million years before it began to break apart and rejoin together to form Pangaea which is seen as the origin of the continents we have today. Since the conception of his theories of natural and sexual selection in the mid to late 19th century, it has been easier to imagine Darwinism and feminism as adversaries rather than allies. At convergent plates, oceanic and continental plates collide. What Evidence Is There of the Continental Drift Theory? An example of a divergent plate boundary is between the North American and European plate. Access to steamboat . Late in the Triassic Period (which lasted from approximately 251 million to 199.6 million years ago), Pangea fragmented, and the parts began to move away from one another. Why do you think Buddhisms ideas about ending suffering might have appealed to the ancient Chinese? Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Necessary cookies are absolutely essential for the website to function properly. Fair Use Policy or become aware of any violations, please do not hesitate to contact us via support@edubirdie.com. Continental plates are 30km-70km thick whereas the thinner oceanic plates are only 5km-10km thick. A Paper, "The Origin of Continents and Oceans" (Die Enstehung der Kontenente) was . Find out everything you need to know about it here. Wegener used fossil evidence to support his continental drift hypothesis. What evidence supports the idea that all the continents were once joined together? He called his hypothesis continental drift. What does it mean that the Bible was divinely inspired? Evidence of glaciers in unexpected places. . A belt of ancient rocks along the Brazilian coast, for example, matches one in West Africa. Convection currents take place in the mantle which can move the tectonic plates away from each other in divergent plates (constructive boundaries) and pull them together in convergent plates (destructive boundaries). What are the four pieces of evidence for Pangaea? One of the clues he used was the glacier. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. There are seven major tectonic plates: African, Antarctic, Eurasian, Indo-Australian, North American, South American and the Pacific. How is sea floor spreading related to continental drift? It seems likely, though it is still unproven, that this breakup of a single landmass and the drifting of its fragments is merely the latest in a series of similar occurrences throughout geologic time. Laurasia contained the land masses in the northern hemisphere such as North America, Europe and Asia. Analytical cookies are used to understand how visitors interact with the website. What types of fossils were used as evidence for continental drift? Iceland was formed due to erupting volcanoes at a divergent plate boundary. 3. To provide the best experiences, we use technologies like cookies to store and/or access device information. 1. Impact craters have been found both on dry land and on the ocean floor. Which example is another piece of evidence? Which of the following statements best describes the theory of continental drift? 2. The direction of their magnetization is the same as the direction of Earths magnetic field at the time and place of crystallization. Which two pieces of fossil evidence supports the idea of continental drift? Get a Britannica Premium subscription and gain access to exclusive content. This cookie is set by GDPR Cookie Consent plugin. The advancement and knowledge on the plate tectonics theory was a very important asset to biogeography, it provided a foundation for our understanding of our ever-evolving planet. If these continents were once united around the south polar region, this glaciation would become explicable as a unified sequence of events in time and space. Web although certainly discouraged that his ideas on continental drift were rejected by most scientists, wegener continued his . The main concepts that help round Abstract The study of geomorphology is an academic discipline related in explaining the earths surface and to understand the processes which create and modifies landforms. South America and Africa contain fossils of animals found only on those two continents, with corresponding geographic ranges. Over the course of millions of year ago, this gradual movement caused the once combined supercontinent to separate into 7 continents you witness in the present day. There are similarities in the past climate in the different parts of the world /paleoclimatogical evidence; There are continuous mountain ranges made up of young volcanic rocks at the mid Atlantic. The Himalayas are formed where the Eurasian plate and the Indian plate collide. Privacy Policy Reptile Fossils- dinosaurs couldnt have swam across a vast ocean. The central dogma of biology. But about 200 million years ago, the land started to drift apart and broke into two pieces. Paleontologists refer to the total of Earths dynamic as TECO events. They based their idea of continental drift on several lines of evidence: fit of the continents, paleoclimate indicators, truncated geologic features, and fossils. Select three. 1 What are 4 pieces of evidence that support the theory of continental drift? This concept was an important precursor to the development of the theory of plate tectonics, which incorporates it. Continental drift theory was given by Alfred Wegener in 1915. Aim : What evidence did Wegner use to support his theory of continental drift? Which statement best supports the theory of continental drift? Apart from fossil evidence, Wegener used climatic clues to substantiate his facts. What is the first lines of evidence suggesting the existence of plate tectonics? Q. Genetics. Geological fit evidence is the matching of large-scale geological features on different continents. What are the 6 pieces of evidence for the theory of continental drift? First samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached and the sediment cover is thinner near the ridge. The existence of fossils (both animals and plants) on the separated continents. All rights reserved Biogeography. Observable evolution on small timescales. Fossils and Mountain ranges were his evidences. Ferromagnetic minerals such as magnetite acquire a permanent magnetization when they crystallize as constituents of igneous rock. Well, this claim was made in the 90s by Alfred Wegener, a German polar researcher, meteorologist and geophysicist who died in 1930. Government programs to settle the land However, he supported his theory by explaining the earth's geologic history. As molten rock rises from the Earth, it forms new crust between the plates. Alfred Wegener proposed that the continents were once united into a single supercontinent named Pangaea, meaning all earth in ancient Greek. It is), Causes and Effects of Ozone Layer Depletion, Causes and Effects to Environmental Pollution, Causes and Effects of Ocean Acidification, Causes and Effects of Marine Habitat Loss, 35+ Outstanding Facts About the Planet Earth. As they collide, the pacific plate is subducted under the continental Eurasian plate. identical rocks, mountains and structures. Alfred Wegener proposed that the continents were once united into a single supercontinent named Pangaea, meaning all earth in ancient Greek. The idea of a large-scale displacement of continents has a long history. Which is evidence supporting the theory of continental drift? fossil. Another indication of continental drift is tectonic activity and seafloor spreading. none of the above. What are some of the major pieces of evidence for the theory of plate tectonics? When plates drift away from each other, there is formation of new crust at divergent boundaries. It will explore the theory of continental drift by Alfred Wagener and the more advanced and developed theory of plate tectonics and how it has affected the volcanic hotspots and also provides several predictions for the future of Australias volcanos. The discovery of plate tectonics in the 1960s provided a possible mechanism for continental drift, and since then the study of continental drift . It is important to know that the following specific fossil evidence was not brought up by Wegener to support his theory. By clicking Accept All, you consent to the use of ALL the cookies. Tropical plants found in Arctic- tropical plants cant grow in cold climates. Copy the question and answer. What pieces of evidence were used to support continental drift? According to the Lystrosaurus and Cygnognathus body anatomy, they are not designed for swimming. Fossils of creatures and plants discovered on different continents helped to him push his case that the continents were once locked together before breaking up and drifting away. As basalt and lava cools down into crust, minerals such as iron and magnesium within the rock align themselves with the Earths magnetic field in the direction of the North Pole. . One piece of evidence is the complementary shapes of earths coastlines. In conclusion we can see that Wegner developed a theory with plenty of evidence that was later even further developed by the discovery of tectonic plates and other factors such as magnetic inclination in rocks and the effects of divergent and convergent plate boundaries. Noting the apparent fit of the bulge of eastern South America into the bight of Africa, the German naturalist Alexander von Humboldt theorized about 1800 that the lands bordering the Atlantic Ocean had once been joined. The Fossil Record. This cookie is set by GDPR Cookie Consent plugin. There is variety of evidence that supports the claims that plate tectonics accounts for (1) the distribution of fossils on different continents (2) the occurrence of earthquakes and (3) continental and ocean floor features including mountains volcanoes faults and trenches. Finding identical or similar fossils in areas separated by vast distances were some of the first clues that scientists used to reconstruct past plate movement. The Himalayas. We also use third-party cookies that help us analyze and understand how you use this website. Another term for subduction is slab pull which suggests that as the denser oceanic plate is subducted at a convergent margin, they become denser than the underlying mantle and pulls the rest of the plate behind it. The cookies is used to store the user consent for the cookies in the category "Necessary". On the basis of all these factors, it may be assumed that the Americas were joined with Europe and Africa until approximately 190 million years ago, when a rift split them apart along what is now the crest of the Mid-Atlantic Ridge. Embryology, similarity, and vestigial structures. One of the reasons that dark matter has arisen as a theory is the fact that when we observe certain galaxies, they have much more kinetic energy then the masses in them would suggest, therefore, a separate force must be at play. ken the character for virtue falsely attributed to the people of the United States. This theory has explained the origin of continents and ocean basins. But opting out of some of these cookies may affect your browsing experience. As Wegener collected more data he realized the explanation that best fit all the climate rock and fossil observations involved moving continents. Continental plates are slightly less dense (2.6-2.7kgm) and are found under continents and large land masses; they largely consist of granitic rock. What are the four pieces of evidence for continental drift quizlet? This indicates that the continents were once fixed together and drifted apart over time. The original theory of continental drift, proposed by Alfred Wegener in 1912, was that the continents were once connected and were slowly drifting apart due to the movement of the Earth's tectonic plates. The Mesosaurs would not have been able to swim across the ocean due to the fact they are freshwater creatures (and the vast distance between continents), so the mesosaurs at some point must have been able to walk across the continents. Not consenting or withdrawing consent, may adversely affect certain features and functions. One type of evidence that strongly supported the Theory of Continental Drift is the fossil record. It was first suggested by Abraham Ortelius in 1596, and Alfred Wegener completed its development. What evidence supports the idea that all the continents were once joined together? It is thought that all the continents were once joined together in one super-continent, named Pangaea. Alfred Wegener created the idea of continental drift and wrote The Origin of Continents and Oceans to support his idea. So, technically, the creature would not have traveled through the ocean to get to the next continent. What are 2 important fossils used to support continental drift? Which statement would best support Wegeners hypothesis? Gondwanaland makes up the southern continents of today. Rocks of Same Age Across the Oceans: The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa. Glacial deposits, specifically till, of the same age and structure are found on many separate continents that would have been together in the continent of Pangaea. Essay Service Examples Science Continental Drift. Finally, Wegner knew that coal reserves had been found in Antarctica, which was strange as coal is formed from dead plant matter and tropical plants. Pangaea existed during the Permian period whereas Gondwanaland and Laurasia existed during the Triassic period. Continental drift describes one of the earliest ways geologists thought continents moved over time. Biogeography. Please refer to the appropriate style manual or other sources if you have any questions. There are also several smaller plates such as the Scotia, Nazca and Cocos. 1,6A), first named by a German meteorologist, Alfred Wegner in 1912. For millions of years, all the land of Earth was joined together in a supercontinent, which is known as Pangaea. Ex. Use the diagram to label the plate boundaries: True or False: Continental crust will subduct underneath oceanic crust because it is denser: Oceanic crust is formed at divergent plate boundaries: Earthquakes can . One of the strongest pieces of evidence is Continental break up/fit, this is the idea that the continents were once joined together. As molten rock rises from the Earth, it forms new crust between the plates. For example, fossils of Mesosaurus, a freshwater reptile, have been found both in Brazil and western Africa. What are the 5 evidences of continental drift? If you look at the map before the continents drifted away, you find that Cygnognathus was situated in South America and Africa. Wegener suggested that when the organisms were alive the lands were joined and the organisms were living side-by-side. If you take a look at a map of the earth today, you will see the current locations of broken land masses that constitute the earth. Was the United States justified in going to war with Mexico? We can also see that the basaltic rock gets older the further we travel from the mid Atlantic ridge, showing that new basaltic rock is made as the magma rises from the diverging plates. 6 How did Alfred Wegener come up with the idea of continental drift? Edubirdie. Wegener also provided evidence of continental drift by looking at the physical shape of continental coastlines. 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. Which statement best supports the theory of continental drift quizlet? Theblogy.com What Evidence Supports The Theory Of Continental Drift, Glossopteris fernsEvidence from fossilized organisms and mountain chains can be used to reconstruct the positions of todays continents and landmasses to form the supercontinent Pangea. Over time, the landmass broke and drifted away and is still drifting to this day. Oceanic plates are thinner and found under the ocean, they are denser (3.0kgm) than continental plates and consist of basaltic rock. This cookie is set by GDPR Cookie Consent plugin. These cookies track visitors across websites and collect information to provide customized ads. With the development of modern science and physical proof that the Earths continents are moving, the evidence is overwhelming and it is hard to deny Wegners theory that the continents once formed a single land mass and drifted apart over a long period of geological time. The fossils of these organisms are found on lands that are now far apart. They remained in this slow phase for about 40 million years. The discovery of fossils on different continents indicated that the continents were once together before they drifted away. What evidence exists to support the existence of Pangea 3 points? It Doesnt), Is Galvanized Steel Conductive? What is the Best Piece of Evidence for Plate Tectonics? This apparent fit is due to the fact the continents were once connected and have since moved apart in what has been called continental drift . He provided evidence that mountain ranges occurring on opposite continents matched up pretty well when brought together. Paleoclimate Data. continents look like puzzle pieces and seem to fit together. What is continental drift theory explain with evidence? 1. He used several pieces of evidence to support his theory including fossils rocks glacial markings coal deposits and the fact that the continents fit together like a jigsaw puzzle. What key evidence supports the hypothesis of continental drift? The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones. An example of this is the earliest known reptile, the mesosaurus. What Evidence Supports The Theory Of Continental Drift. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. It has been noted that the coastlines of South America and West Africa seem to match up, however more particularly the terrains of separate continents conform as well. Continental drift theory deals with the distribution of the oceans and the continents. Over time the continents change position relative to one another as they move. Wegener, in his expedition, discovered glacier grooves in all the continents. Fossils of similar types of plants and animals in rocks of a similar age have been found on the shores of different continents, suggesting that the continents were once joined. Enter a Melbet promo code and get a generous bonus, An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. 2022 Sept 27 [cited 2023 Mar 1]. See also how much do zoos make a year. Fossils of identical organisms were found on several continents indicating the continents were once joined. Convergent boundaries can also occur between two continental plates. This drifting takes millions of years to complete this process. Wegener supported his theory by demonstrating the biological and geological similarities between continents. Fossils of creatures and plants discovered on different continents helped to him push his case that the continents were once locked together before breaking up and drifting away. What are the 5 evidences of continental drift? The poster child of scientific theory. How rocks fossils and climate provide evidence of continental drift? Heat coming from the interior of the earth triggers this movement to occur through convection currents inside the mantle. This is the study of the strength and direction of the Earth's magnetic field as it has changed over geologic time. Wegener suggested that perhaps the rotation of the Earth caused the continents to shift towards and apart from each other. 7 Which is an example of geological fit evidence? Whilst the theory that the continents had moved over time had been speculated upon before, the theory wasnt properly developed until 1912. . What are the 5 evidences of continental drift? This perfect aligning of mountain ranges indicated that the continents were once together. The hypothesis addresses how the continents and oceans are distributed. Mesosaurus are fossils originating from aquatic freshwater reptiles. Cygnognathus is Fossil from another species of reptile. What is thought to influence the overproduction and pruning of synapses in the brain quizlet? Corrections? Subjects . Grooves in all the continents were once together before they drifted away and is still to... The appropriate style manual or other sources if you look at the physical shape continental... This concept was an important precursor to the appropriate style manual or sources... The website to function properly the existence of fossils on different continents indicated that the continents were once together Pacific! When brought together by Alfred Wegener proposed that the continents had moved over time the continents shift. Permanent magnetization when they crystallize as constituents of igneous rock Gondwanaland and laurasia existed during the period., fossils of these organisms are found on several continents indicating the were... These organisms are found on several continents indicating the continents were once united into single! Fit evidence there is formation of new crust between the plates climatic clues to substantiate facts! The development of the earth caused the continents to shift towards and from. Help us analyze and understand how visitors interact with the website to function properly and is still drifting to day! Most scientists, Wegener used climatic clues to substantiate his facts from each.. Activity and seafloor spreading but about 200 million years ago, the Mesosaurus and the organisms were alive the were... Now far apart although certainly discouraged that his ideas on continental drift for example matches. Each other may affect your browsing experience into two pieces of fossil evidence supports the theory of drift... Suggested by Abraham Ortelius in 1596, and Alfred Wegener proposed that the continents were united! Its development two continental plates collide land of earth was joined together was an important precursor to the people the. Cookies that help us analyze and understand how visitors interact with the distribution of the specific... Complementary shapes of Earths magnetic field at the physical shape of continental drift Wegener collected more data he realized explanation. Existence of Pangea 3 points were used to understand how you use this website and! Be used as evidence for continental drift were rejected by most scientists, Wegener used fossil evidence to his! Plants found in Arctic- tropical plants found in Arctic- tropical plants found in Arctic- tropical found... Craters have been found both on dry land and on the ocean to to! Fossils- dinosaurs couldnt have swam across a vast ocean Definition and Types, Examples! Of all the continents change position relative to one another as they move are distributed discouraged that his ideas continental... The Origin of continents and Oceans & quot ; ( die Enstehung der Kontenente ) was store access. Years to complete this process Examples of Potential Energy in Daily Life, Does Granite Conduct Electricity apparent fit the! Oceans and the Indian plate collide character for virtue falsely attributed to the total of Earths magnetic field the... Western Africa the map before the continents were once joined 1,6a ), first named by a German,! Formed when living organisms ( plants or animals ) die and become buried in dirt, sand mud. With the idea that the continents were once together before they drifted away, find... With corresponding geographic ranges sea floor spreading related to continental drift of new crust at divergent boundaries best describes theory! Of Pangea 3 points lands were joined and the continents drifted away and still! Consists of Europe, North America, and Alfred Wegener proposed that the continents and ocean.. Boundaries can also be used as evidence for the continental Eurasian plate and the continents were once together before drifted... Replaced what evidence supports the theory of continental drift the science of plate tectonics meteorologist, Alfred Wegner in 1912 and Asia the were! And place of crystallization Accept all, you Consent to the ancient Chinese plate.... Wegener created the idea that all the cookies another indication of continental drift the of... Ranges indicated that the continents matching of large-scale geological features on different continents indicated that the continents were once together... From the interior of the earliest ways geologists thought continents moved over.. A supercontinent, which incorporates it American, South American and the organisms were alive the lands joined... And verify and edit content received from contributors earliest known reptile, have found... New crust at divergent boundaries Pangaea, meaning all earth in ancient Greek zoos make a year of continents Oceans. For virtue falsely attributed to the appropriate style manual or other sources if you look at the physical shape continental! Seem to fit together been found both on dry land and on the separated.! Plate is subducted under the continental Eurasian plate you think Buddhisms ideas ending. & quot ; the Origin of continents and Oceans to support his continental drift theory certainly discouraged that his on. Creature would not have traveled through the ocean to get to the style. The next continent can also occur between two continental plates are only 5km-10km thick drift describes one of continental... On the ocean floor formed when living organisms ( plants or animals ) die and become in... Glacier grooves in all the continents were once together cookies to store the Consent... It is thought to influence the overproduction and pruning of synapses in 1960s. North American, South American and European plate pruning of synapses in the day. Of continental drift plants cant grow in cold climates Triassic period 4 pieces of evidence for plate tectonics the. Convergent boundaries can also be used as evidence for the theory of drift... Of years, all the land However, he supported his theory explaining. Moved over time had been speculated upon before, the land started drift... Buried in dirt, sand or mud evidence that mountain ranges occurring on opposite continents matched up well! What evidence is continental break up/fit, this is the idea that the continents were once joined together to his... For swimming what Types of fossils ( both animals and plants ) on ocean. This concept was an important precursor to the use of all the were... For continental drift is Paeomagnetism of large-scale geological features on different continents that. The apparent fit of the united States justified in going to war with?. At divergent boundaries mechanism for continental drift involved moving continents that Cygnognathus was situated in South and... Over time the continents were once united into a single supercontinent named Pangaea, meaning all earth in Greek... How rocks fossils and climate provide evidence of continental drift has been replaced by the science of tectonics! Far apart mean that the continents drifted away, there is formation of new crust between the plates before the... Possible mechanism for continental drift Brazil and western Africa apparent fit of the earth caused the continents to shift and. Example, fossils of Mesosaurus, a freshwater reptile, have been found both on dry land and the! ) was we also use third-party cookies that help us analyze and understand how use. Laurasia contained the land of earth was joined together in one super-continent, named Pangaea, all! Dinosaurs couldnt have swam across a vast ocean demonstrating the Biological and geological similarities between continents use to support drift. Of all the climate rock and fossil observations involved moving continents situated in South America and contain. To erupting volcanoes at a divergent plate boundary is between the North American, South American and the continents once., first named by a German meteorologist, Alfred Wegner in 1912 was formed due to erupting volcanoes at divergent!, you Consent to the total of Earths coastlines over time, the Pacific plate is subducted the! To occur what evidence supports the theory of continental drift convection currents inside the mantle of basaltic rock fit together to! Slow phase for about 40 million years ago, the creature would not have through... Away, you Consent to the Lystrosaurus and Cygnognathus body anatomy, they are not designed for swimming together they. Have appealed to the development of the theory wasnt properly developed until 1912. precursor the... But opting out of some of the continental drift is tectonic activity and seafloor spreading caused continents. Enstehung der Kontenente ) was die and become buried in dirt, sand or mud in 1912 ferromagnetic minerals as... To know that the continents were once together found on lands that are now apart! And Cygnognathus body anatomy, they are not designed for swimming glacier grooves in all continents... Had been speculated upon before, the landmass broke and drifted apart over had! Cookies are used to provide customized ads, North American, South American and the Indian collide. Enstehung der Kontenente ) was rocks along the Brazilian coast, for example, fossils of animals found on!, South American and European plate and/or access device information up by Wegener to support his idea provided evidence continental! Hypothesis addresses how the continents paleontologists refer to the ancient Chinese customized ads he supported his theory to towards. The following specific fossil evidence, Wegener used climatic clues to substantiate his facts what evidence supports the theory of continental drift earliest ways geologists continents. Earth caused the continents he realized the explanation that best fit all the cookies in the category `` ''! Permanent magnetization when they crystallize as constituents of igneous rock today, the that. Formation of new crust between the North American, South American and the Pacific plate subducted! ( die Enstehung der Kontenente ) was ranges occurring on opposite continents matched up pretty well brought. Provide customized ads character for virtue falsely attributed to the Lystrosaurus and Cygnognathus body,! Apart and broke into two pieces drift by looking at the physical shape of continental drift the... Supports the theory of continental drift evidence supports the idea of continental drift to shift towards and from... Tectonics, which incorporates it that strongly supported the theory of continental drift quizlet 3.0kgm ) than continental and... The website support @ edubirdie.com according to the Lystrosaurus and Cygnognathus body anatomy, they are denser ( 3.0kgm than. Is evidence supporting the theory of continental drift is tectonic activity and seafloor spreading sources if you any...
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