Continental drift
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Alfred Wegener first developed the theory of continental drift, proposing that the continents were once joined together in a supercontinent called Pangaea. Pangaea existed approximately 300 million years ago but began breaking apart after 100 million years. Wegener's ideas were initially rejected by the scientific community but are now widely accepted. Evidence for continental drift includes the apparent fit of coastlines, matching fossil records, identical rock and mountain structures found across oceans, and paleoclimate data that suggests regions were in different climates when the continents were joined.
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Drifting continents
Preview these presentations in the original state by going to my Educational Resource site Teach Power http://teachpower.net
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CONTINENTAL DRIFT THEORY PPT
Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
Wegener argued that there was once a super continent (which he named Pangea -meaning ''all land ) which split up over millions of year and gradually drifted over to their current place on earth at a rate of a few centimeter year.
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The document discusses Alfred Wegener's theory of continental drift from the early 1900s. Wegener found evidence that the continents were once joined together in a single landmass, called Pangaea, before drifting apart to their current locations. He provided several lines of evidence including matching fossil records, mountain ranges, and glacial deposits found on different continents. While controversial at the time, his theory of continental drift is now supported by modern plate tectonics.
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Preview these presentations in the original state by going to my Educational Resource site Teach Power http://teachpower.net
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Continental drift is the hypothesis that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed.
Wegener argued that there was once a super continent (which he named Pangea -meaning ''all land ) which split up over millions of year and gradually drifted over to their current place on earth at a rate of a few centimeter year.
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Alfred Wegener first proposed the theory of continental drift in the early 20th century. He noticed that the continents appeared to fit together and were once attached in a supercontinent called Pangaea. Wegener provided evidence from matching coastlines, fossil and rock formations, and paleoclimatic data to support his theory. However, he was unable to explain the mechanism of continental drift. Most geologists at the time rejected his theory due to the lack of a clear explanation for how and why the continents would move. It was not until the 1950s when the theory of plate tectonics was developed that Wegener's concept of continental drift became widely accepted.
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Continental Drift Theory by Rajkumar
1. CONTINENTAL DRIFT
“Father” of this theory is Alfred Wegener.
2. The Theory of Continental Drift
Proposed by Alfred Wegener (1912):-
A large super-continent PANGEA split into smaller fragments about 200-300 million years ago. These then drifted apart to form the present arrangement of continents.
Most geologists were highly skeptical and the idea was NOT widely accepted.
3. This is what Wegener thought Pangea looked like 200-300 million years ago.
4. EVIDENCE OF CONTINENTAL DRIFT
Wegener provided four main pieces of evidence to support his theory that the continents had been drifting over time.
5. 1. JIGSAW PUZZLE
Wegener noticed that if we could move present day continents around, several continents look like they would fit together like pieces of a jigsaw puzzle.
6. 2. FOSSILS
Wegener also found fossils of the same plants and animals on different continents now separated by vast oceans. They could only be found this way if the continents had once been joined together.
7. 3. ROCK SEQUENCE
Wegener also found that mountain ranges have a similar sequence of type of rock and age on both sides of the Atlantic Ocean, suggesting they were once part of the same mountain range.
8. 4. GLACIAL SCARS
Wegener found evidence of glacial scars left behind by giant ice sheets from the same time period in Southern Africa, India, Australia and South America.
The white areas were covered by ice and tundra about 300 million years ago (arrows show the direction of ice movement).
the continents were once part of a single larger continent that then split apart, drifting to their present positions over the last 300 million years.
9. WHAT COULD MOVE THE CONTINENTS?
Unfortunately for Wegener, he could not explain what force was powerful enough to move entire continents around the planet.
For reasons was he can't explain
Alfred Wegener died on expedition in Greenland in 1930 still searching for answers to the question of what force could be responsible for the movement of the continents.
10. Reason for Support Continental Drift?
Fit of continents
Apparent discrepancy in inferred latitudes of ancient rocks
Rocks of same age and similar characteristics on different continents
Distribution of similar plants and animals on different continents
11. WEGENERS CONCLUSIONS:
The continents have drifted over the past 300 million
years to their present positions!
(not a very popular idea at the time!!!)
The Universe and The MILKY WAY GALAXY
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire Universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light years in diameter. In various multiverse hypotheses, a universe is one of many causally disconnected constituent parts of a larger multiverse, which itself comprises all of space and time and its contents. The earliest cosmological models of the Universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the center. Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System. In developing the law of universal gravitation, Isaac Newton built upon Copernicus' work as well as Johannes Kepler's laws of planetary motion and observations by Tyche Brahe. Further observational improvements led to the realization that the Sun is one of hundreds of billions of stars in the Milky Way, which is one of at least hundreds of billions of galaxies in the Universe. Many of the stars in our galaxy have planets. At the largest scale, galaxies are distributed uniformly and the same in all directions, meaning that the Universe has neither an edge nor a center. At smaller scales, galaxies are distributed in clusters and superclusters which form immense filaments and voids in space, creating a vast foam-like structure. The Big Bang theory is the prevailing cosmological description of the development of the Universe. Under this theory, space and time emerged together 13.799±0.021 billion years ago and the energy and matter initially present have become less dense as the Universe expanded.
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Tycho Brahe made extensive and accurate astronomical observations over many years, amassing a large collection of data on planetary positions and movements. Johannes Kepler used Brahe's data to formulate his Three Laws of Planetary Motion, providing the first mathematically-based model of the solar system. Galileo used the newly invented telescope to make observations of the moon, planets, and stars that supported Copernicus' heliocentric theory and contradicted Aristotle's geocentric model, leading to conflict with the Church. Isaac Newton subsequently developed his laws of motion and universal law of gravitation, providing a unified framework for understanding motion and gravity in the heavens and on Earth.
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The Earth is a planet in the solar system that revolves around the sun. It is composed of solid elements like the crust, mantle and core, liquid elements like water in the hydrosphere, and gaseous elements in the atmosphere. The Earth rotates on its axis, causing day and night, and revolves around the sun, causing the seasons. Its orientation and location can be described using lines of latitude, longitude, and cartographic projections which allow its spherical shape to be represented on flat maps.
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The document summarizes theories of continental drift and plate tectonics. In 1915, Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core. Wegener hypothesized that around 200 million years ago, all the continents were joined together in a supercontinent called Pangaea. Pangaea later broke apart into smaller supercontinents, and by the end of the Cretaceous period the continents had separated into their modern positions. In the 1960s, Harry Hess proposed the theory of seafloor spreading, which provided support for continental drift by showing how ocean floors spread outward from underwater ridges. Plate tectonics expanded on these ideas
Alfred Wegener, Pangea, A+.ppt.pptxhshsh
Alfred Wegener originally proposed the theory of continental drift in the early 20th century, hypothesizing that the continents are slowly drifting around the Earth. He suggested that hundreds of millions of years ago, all the continents were joined together in a single landmass called Pangea. Pangea has since broken apart, with evidence found in matching fossil and rock formations between separated continents and the way the continents appear to fit together like puzzle pieces. While initially criticized, Wegener's theory of continental drift has since been supported by further evidence of plate tectonics showing how the movement of tectonic plates can cause the continents to drift apart over millions of years.
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The document discusses the Earth and its movement. It begins by explaining how the universe formed over 13.7 billion years and includes celestial bodies, galaxies, and planetary systems with a star and objects orbiting it. The Earth formed 4.6 billion years ago and is the only planet that supports life. It can support life because it has a moderate temperature, an atmosphere with oxygen, water, and its shape is spherical. The Earth rotates on its axis, causing day and night, and it orbits the sun over 365 days, causing seasons. Its rotation and orbit are responsible for its climate zones and the length of days and nights changing over the year.
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The Earth is a planet in the solar system that revolves around the sun and rotates on its axis. It has three main components - the atmosphere, hydrosphere, and geosphere. The atmosphere contains gases and surrounds the planet. The hydrosphere is made up of all water on Earth, found mainly in oceans. The geosphere consists of solid elements in three layers - crust, mantle, and core. The Earth's rotation causes day and night and its revolution around the sun causes the seasons. Maps represent the Earth's surface and use techniques like cartographic projections to depict the spherical planet on a flat surface.
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Shikhar Mishra, an 8th grade student from Evergreen Public School, wrote a report on the topic of the universe for their science class. The document defines the universe as everything that exists, including all matter, energy, planets, stars and galaxies. It discusses that the universe has existed under consistent physical laws for most of its history. The night sky contains billions of stars that are grouped into galaxies like the Milky Way galaxy. The document then provides more details about various astronomical objects and concepts like stars, constellations, our solar system and the planets.
Continental Drift Theory
Alfred Wegener first proposed the theory of continental drift in the early 20th century. He noticed that the continents appeared to fit together and were once attached in a supercontinent called Pangaea. Wegener provided evidence from matching coastlines, fossil and rock formations, and paleoclimatic data to support his theory. However, he was unable to explain the mechanism of continental drift. Most geologists at the time rejected his theory due to the lack of a clear explanation for how and why the continents would move. It was not until the 1950s when the theory of plate tectonics was developed that Wegener's concept of continental drift became widely accepted.
Unit 1. Planet Earth
The Earth is a planet in the solar system that revolves around the sun and rotates on its axis. It has three main components - the atmosphere, geosphere, and hydrosphere. The atmosphere provides breathable air and protects the surface. The geosphere includes the crust, mantle, and core that make up the planet. Most of the Earth's surface is covered by the hydrosphere, which contains oceans, seas, rivers, lakes, and groundwater. The Earth rotates daily on its axis, causing day and night, and revolves yearly around the sun, causing seasons. Maps represent the Earth's surface and use projections to portray the spherical planet on a flat surface.
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This document provides an overview of the solar system and related vocabulary for 5th grade science. It defines key terms like sun, solar system, planet, orbit, and moon. It notes that the solar system consists of the sun and objects that orbit it, including seven major planets. It discusses how early scientists like Ptolemy incorrectly believed the Earth was the center of the universe, while later scientists like Alhazen and Copernicus correctly proposed that the Earth and planets instead orbit the sun. It also mentions that Neil Armstrong was the first person to walk on the moon.
Astronomy and the invention of Telescope
Before telescopes, ancient civilizations observed astronomical phenomena like star clusters and used constellations for agriculture and navigation. The Greeks developed geocentric models to mathematically describe planetary motions, prioritizing mathematical accuracy over physical reality. In the early 1600s, Hans Lippershey invented the telescope and Galileo was the first to use it for astronomy, discovering lunar craters, Jupiter's moons, Venusian phases, and sunspots, challenging existing paradigms.
Continental Drift Theory by Rajkumar
1. CONTINENTAL DRIFT
“Father” of this theory is Alfred Wegener.
2. The Theory of Continental Drift
Proposed by Alfred Wegener (1912):-
A large super-continent PANGEA split into smaller fragments about 200-300 million years ago. These then drifted apart to form the present arrangement of continents.
Most geologists were highly skeptical and the idea was NOT widely accepted.
3. This is what Wegener thought Pangea looked like 200-300 million years ago.
4. EVIDENCE OF CONTINENTAL DRIFT
Wegener provided four main pieces of evidence to support his theory that the continents had been drifting over time.
5. 1. JIGSAW PUZZLE
Wegener noticed that if we could move present day continents around, several continents look like they would fit together like pieces of a jigsaw puzzle.
6. 2. FOSSILS
Wegener also found fossils of the same plants and animals on different continents now separated by vast oceans. They could only be found this way if the continents had once been joined together.
7. 3. ROCK SEQUENCE
Wegener also found that mountain ranges have a similar sequence of type of rock and age on both sides of the Atlantic Ocean, suggesting they were once part of the same mountain range.
8. 4. GLACIAL SCARS
Wegener found evidence of glacial scars left behind by giant ice sheets from the same time period in Southern Africa, India, Australia and South America.
The white areas were covered by ice and tundra about 300 million years ago (arrows show the direction of ice movement).
the continents were once part of a single larger continent that then split apart, drifting to their present positions over the last 300 million years.
9. WHAT COULD MOVE THE CONTINENTS?
Unfortunately for Wegener, he could not explain what force was powerful enough to move entire continents around the planet.
For reasons was he can't explain
Alfred Wegener died on expedition in Greenland in 1930 still searching for answers to the question of what force could be responsible for the movement of the continents.
10. Reason for Support Continental Drift?
Fit of continents
Apparent discrepancy in inferred latitudes of ancient rocks
Rocks of same age and similar characteristics on different continents
Distribution of similar plants and animals on different continents
11. WEGENERS CONCLUSIONS:
The continents have drifted over the past 300 million
years to their present positions!
(not a very popular idea at the time!!!)
The Universe and The MILKY WAY GALAXY
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire Universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light years in diameter. In various multiverse hypotheses, a universe is one of many causally disconnected constituent parts of a larger multiverse, which itself comprises all of space and time and its contents. The earliest cosmological models of the Universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the center. Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System. In developing the law of universal gravitation, Isaac Newton built upon Copernicus' work as well as Johannes Kepler's laws of planetary motion and observations by Tyche Brahe. Further observational improvements led to the realization that the Sun is one of hundreds of billions of stars in the Milky Way, which is one of at least hundreds of billions of galaxies in the Universe. Many of the stars in our galaxy have planets. At the largest scale, galaxies are distributed uniformly and the same in all directions, meaning that the Universe has neither an edge nor a center. At smaller scales, galaxies are distributed in clusters and superclusters which form immense filaments and voids in space, creating a vast foam-like structure. The Big Bang theory is the prevailing cosmological description of the development of the Universe. Under this theory, space and time emerged together 13.799±0.021 billion years ago and the energy and matter initially present have become less dense as the Universe expanded.
DO LIKE COMMENT AND FOLLOW
Brahe and kepler
Tycho Brahe made extensive and accurate astronomical observations over many years, amassing a large collection of data on planetary positions and movements. Johannes Kepler used Brahe's data to formulate his Three Laws of Planetary Motion, providing the first mathematically-based model of the solar system. Galileo used the newly invented telescope to make observations of the moon, planets, and stars that supported Copernicus' heliocentric theory and contradicted Aristotle's geocentric model, leading to conflict with the Church. Isaac Newton subsequently developed his laws of motion and universal law of gravitation, providing a unified framework for understanding motion and gravity in the heavens and on Earth.
The Atmosphere
Created by María Jesús Campos Fernández, Social Studies, History and Geography teacher in a bilingual section in Madrid (Spain)
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This is a powerpoint showing the Pangaea theory. A theory of the continents once forming a huge super continent before breaking apart. Alfred Weneger, a German scientist, was the one who thought of the continents once existing as one before splitting and breaking apart.
Unit 1. Planet Earth
The Earth is a planet in the solar system that revolves around the sun. It is composed of solid elements like the crust, mantle and core, liquid elements like water in the hydrosphere, and gaseous elements in the atmosphere. The Earth rotates on its axis, causing day and night, and revolves around the sun, causing the seasons. Its orientation and location can be described using lines of latitude, longitude, and cartographic projections which allow its spherical shape to be represented on flat maps.
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This document provides an overview of an 11th grade English lesson about Earth. The lesson goals are to learn words related to places in the universe and large numbers, answer questions about the Earth, and write sentences using the present perfect active and passive forms. The document then provides facts about the Earth, such as its age, distance from the sun, rotation and revolution periods, and population of humans, animals and plants. It concludes with examples of changing sentences between active and passive voice.
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I am a student of SUST and my subject is "Geography & Environment". Topic of this presentation is " Continental Drift Theory and Plate Tectonic ".
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Saturn´s Moon Titan shows many incredible features as; only liquid bodies observed in the solar other than Earth, huge seas of hydrocarbons, only moon with a thick atmosphere and also are similar to Earth in that it is dominated by nitrogen, methane and argon. Surface features consistent with erosion and however, it seems highly doubtful it is a good candidate for life.
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The Solar System formed 4.6 billion years ago from the collapse of a giant molecular cloud. It consists of the Sun and objects bound to it by gravity, including eight planets whose orbits are nearly circular, as well as dwarf planets, asteroids, comets, and other small bodies. The four inner terrestrial planets are composed mainly of rock, while the four outer gas giants are much more massive and composed largely of hydrogen and helium. Exploration of the Solar System has increased understanding of its formation and components.
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The document summarizes theories of continental drift and plate tectonics. In 1915, Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core. Wegener hypothesized that around 200 million years ago, all the continents were joined together in a supercontinent called Pangaea. Pangaea later broke apart into smaller supercontinents, and by the end of the Cretaceous period the continents had separated into their modern positions. In the 1960s, Harry Hess proposed the theory of seafloor spreading, which provided support for continental drift by showing how ocean floors spread outward from underwater ridges. Plate tectonics expanded on these ideas
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Alfred Wegener originally proposed the theory of continental drift in the early 20th century, hypothesizing that the continents are slowly drifting around the Earth. He suggested that hundreds of millions of years ago, all the continents were joined together in a single landmass called Pangea. Pangea has since broken apart, with evidence found in matching fossil and rock formations between separated continents and the way the continents appear to fit together like puzzle pieces. While initially criticized, Wegener's theory of continental drift has since been supported by further evidence of plate tectonics showing how the movement of tectonic plates can cause the continents to drift apart over millions of years.
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1) Continental drift is the theory that the continents were once joined together in a supercontinent called Pangaea before slowly drifting apart over hundreds of millions of years.
2) German scientist Alfred Wegener first proposed this theory in 1912, noticing that the continents seemed to fit together like puzzle pieces and that matching fossil and rock formations were found on separated continents.
3) Evidence supporting continental drift includes the matching shapes of continental shelves, the existence of the same fossil species on different continents, identical rock formations in mountain ranges now separated by oceans, and signs that regions which are now polar were once tropical.
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The document discusses the development of the theory of continental drift by Alfred Wegener in the early 20th century. It provides evidence that supported Wegener's hypothesis, including: the fit of continental coastlines, matching fossil distributions, and correlations between rock and mountain formations on different continents. The theory was initially rejected due to the lack of a proposed mechanism for continental movement, but gained renewed interest after the discovery of apparent polar wander in rock magnetic polarity studies.
Continental drift theory
The Continental Drift theory proposed by Alfred Wegener in 1912 suggested that the continents were once joined together in a single landmass called Pangaea. Wegener did not have proof of his theory at the time, but later evidence from matching fossil distributions, identical rock formations between continents, and the same mountain ranges provided support. This included fossils of Glossopteris found across regions of the former supercontinent Gondwanaland. Although controversial when first introduced, the development of the theory of plate tectonics provided the mechanism of plate movement driven by convection currents to explain how the continents could drift apart.
2. Continental Drift.pptx
Here are the answers to the guide questions:
1. The edges and shapes of the torn pieces helped fit them together perfectly like a jigsaw puzzle.
2. The lines of prints and texts continued seamlessly across the pieces when fitted together correctly, proving they were originally part of the same page.
3. With the pieces fitted together, the newspaper/magazine page is complete and legible again without any gaps or overlaps in the text/images, demonstrating it has been reassembled perfectly.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before drifting apart.
2) While Wegener's theory was controversial at the time due to lack of evidence, it was later proven by evidence of matching fossils, rock formations, mountain ranges, and glacial deposits found across continents.
3) Key evidence includes the way continents fit together like puzzle pieces, matching ancient plant and animal fossils found on continent edges, and identical rock sequences and mountain ranges between continents now separated by oceans.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before slowly drifting apart.
2) While Wegener's theory was controversial at the time due to a lack of evidence, it was later proven correct with the discovery of plate tectonics.
3) There is geological evidence that supports the continental drift theory, including matching fossil records, rock formations, mountain ranges, and glacial deposits found across continents.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before slowly drifting apart.
2) While Wegener's theory was controversial at the time due to lack of evidence, it is now widely accepted due to evidence discovered after his death, including matching fossil records, rock formations, and mountain ranges between continents.
3) Key evidence includes the way continents appear to fit together like puzzle pieces, as well as identical fossil plants and animals found on edges of separated continents, supporting the idea that they were once joined.
Continental Drift
1) The document discusses Alfred Wegener's theory of continental drift from 1912, which proposed that the continents were once joined together in a single landmass called Pangaea before slowly drifting apart.
2) While Wegener's theory was controversial at the time due to lack of evidence, it is now widely accepted due to evidence discovered after his death, including matching fossil records, rock formations, and mountain ranges between continents.
3) Key evidence includes the way continents appear to fit together like puzzle pieces, as well as matching plant and animal fossils found on edges of separated continents, supporting the idea that they were once joined.
Continental drift
Continental drift is the slow movement of continents across the Earth's surface due to tectonic plate motions. Evidence for continental drift includes: the matching coastlines of separated continents; matching fossil, rock, and glacial deposits in separated areas; and paleomagnetic data showing continents were once joined. Alfred Wegener first proposed the continental drift theory in 1915, though it was not widely accepted until the 1960s when seafloor spreading was discovered, providing evidence of plate tectonics and explaining the driving force behind continental drift.
Unit 1. 2. 2 continental drift
Earthquakes occur when energy is rapidly released due to movement along faults in the Earth's crust. Fossils found across different continents provide evidence that the continents were once joined together in a supercontinent called Pangaea, which has since broken apart due to continental drift. The theory of continental drift was initially proposed in the early 20th century but was rejected due to the lack of a proposed driving mechanism until the development of the theory of plate tectonics.
Continental drift
Alfred Wegener first introduced the theory of continental drift in 1915, which proposed that the continents were once joined together in a supercontinent called Pangaea before slowly drifting apart. Wegener provided two key pieces of evidence to support this theory - the fit of the continental outlines and matching fossil records found on different continents. However, his theory was initially rejected because he could not explain the mechanism of how the continents moved. It is now accepted that the continents sit on tectonic plates that slowly move due to convection currents in the Earth's mantle, providing the explanation Wegener lacked.
Continental drift - A2 Geography
Continental drift is the slow movement of continents across the Earth's surface over geological time due to tectonic plate motions. Evidence for continental drift includes: the matching continental outlines of separated continents; matching fossil, rock, and glacial deposits between continents; and paleomagnetic data showing continents have moved over time. The theory of continental drift was proposed by Alfred Wegener in 1915 but was not widely accepted until the 1960s when seafloor spreading and plate tectonics were discovered, providing a mechanism to explain continental drift.
A Lfred Wegener
Alfred Wegener was the first scientist to propose the theory of continental drift, which suggests that the continents were once joined together in a supercontinent called Pangaea. He developed this idea after discovering that fossils of the same ancient plant species were found on separate continents. Further evidence for Pangaea and continental drift was that the coastlines of Africa and South America fit together like puzzle pieces. Wegener's theories were controversial at the time but are now widely accepted, making him the founding father of a major scientific revolution in earth sciences.
A Lfred Wegener
Alfred Wegener was the first scientist to propose the theory of continental drift, which suggests that the continents were once joined together in a supercontinent called Pangaea. He developed this idea after discovering that fossils of the same ancient plant species were found on separate continents. Further evidence for Pangaea and continental drift was provided by the matching coastlines of Africa and South America. Wegener's theories were controversial at the time but are now widely accepted, making him the founder of a major scientific revolution in geology.
Alfred wegener presentation
Alfred Wegener proposed the theory of continental drift in the early 1900s, which suggested that the continents were once joined together and have since drifted apart over millions of years. This helped explain similarities in fossils and rock formations across continents. Though initially lacking evidence, Wegener's theory is now widely accepted due to evidence like matching coastlines, fossil and rock matches between continents, and the fit of continents across oceans. The supercontinent Pangaea broke apart into Gondwana and Laurasia around 200 million years ago.
Tectonics: Plate Tectonic Theory history
The document discusses plate tectonics and the evidence that supports the theory. It describes how fossils and rock formations found in different parts of the world provided early evidence that continents have moved over time. It also outlines key evidence from the mid-20th century including the discovery of sea floor spreading and magnetic reversals in ocean crust that helped establish the modern theory of plate tectonics.
Earth Expansion Tectonics - Historical ways of viewing the Earth (Part 3)
“La vida es demasiado corta como para que una persona guarde egoístamente
cualquier nuevo hecho que descubre. Por lo tanto, estoy revelando todo lo que
he aprendido a pesar de que algunos de los datos aún no se han completado del todo.
Muchas mentes piensan mejor que una sola, y es mi ferviente esperanza que a partir
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y desarrollarse tecnológicamente con el fin de servir mejor a la humanidad.”
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The Theory of Pangaea, by : Rebecca
The document summarizes Alfred Wegener's theory of Pangaea from 1910, which proposed that all the continents were originally joined together in a supercontinent called Pangaea. It describes how Pangaea broke apart over millions of years, drifting the continents to their current locations. Fossil, geological, and geographical evidence from matching coastlines, mountain ranges, and glacial deposits on different continents supported the theory that they were once joined.
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- 3. Alfred Wegener Alfred Lothar Wegener (November 1, 1880 – November 1930) was a German polar researcher, geophysicist and meteorologist who developed the first theory of continental drift and formulated the idea that a supercontinent known as Pangaea existed on the Earth millions of years ago. His ideas were largely ignored at the time they were developed but today they are very well accepted by the scientific community.
- 4. Pangaea Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It formed approximately 300 million years ago and then began to break apart after about 100 million years. Unlike the present Earth , much of the land mass was in the Southern Hemisphere . Pangaea was the first reconstructed supercontinent and it was surrounded by a super ocean , known as Panthalassa .
- 7. Apparent fit of the Continents
- 8. Evidence? ???Apparent fit of the Continents The coastlines of the Continents appear to fit together like the pieces of a
- 11. Evidence? ??Apparent fit of the Continents Fossil Correlation Identical Fossils have been found in the rocks on either side of the ocean
- 12. Rock and Mountain Correlation
- 13. Evidence? ?Apparent fit of the Continents Fossil Correlation Rock and Mountain Correlation Identical rocks and mountain structure have been found on either side of the ocean
- 15. Are Made from this But are found here:
- 16. Evidence? Apparent fit of the Continents Fossil Correlation Rock and Mountain Correlation Paleoclimate Data Coal has been found in cold regions and glacial evidence has been found in warm regions
- 17. Death of Alfred Wegener (1880-1930)