PLATE-TECTONICS.pdf
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Alfred Wegener first developed the continental drift hypothesis in the early 20th century. He proposed that the continents were once joined together as a single supercontinent before drifting apart to their current locations. Evidence for continental drift includes matching rock formations and mountain ranges on separate continents, as well as fossils of the same extinct species found in rocks of the same age across continents. Ancient climate zones, such as glacial grooves and deposits now near the equator, also support the idea that continents have moved over time.
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Continental Drift
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.
Integ Sci 10 Lesson 1 [Autosaved].pptx
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 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.
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.
Plate tectonics theory.docx
The document summarizes plate tectonics theory, which proposes that the Earth's outer layer is divided into plates that constantly move over Earth's mantle. There are three main types of plate boundaries: divergent boundaries where plates move apart and new crust is formed, convergent boundaries where plates collide with one subducting under the other, and transform boundaries where plates slide horizontally past one another. Evidence for plate tectonics includes matching fossil and rock formations between continents now separated by oceans, as well as variations in ancient climates that can be explained by past continental configurations.
Continental Drift Theory by Rajkumar
1. CONTINENTAL DRIFT
โFatherโ 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!!!)
Evidence... notes
1) Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since drifted apart.
2) Evidence supporting continental drift includes matching rock formations and fossil records found across separated continents, as well as similar fossils of tropical plants found in arctic regions, indicating past warmer climates.
3) The theory of plate tectonics emerged as scientists discovered that the ocean floors are formed through sea floor spreading at mid-ocean ridges, with the youngest rocks found at the ridges and increasing in age further away. This supported Wegener's theory that continents have moved over time.
Continental Drift Theory and Plate Tectonic
I am a student of SUST and my subject is "Geography & Environment". Topic of this presentation is " Continental Drift Theory and Plate Tectonic ".
Recommended
Continental Drift
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.
Integ Sci 10 Lesson 1 [Autosaved].pptx
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 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.
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.
Plate tectonics theory.docx
The document summarizes plate tectonics theory, which proposes that the Earth's outer layer is divided into plates that constantly move over Earth's mantle. There are three main types of plate boundaries: divergent boundaries where plates move apart and new crust is formed, convergent boundaries where plates collide with one subducting under the other, and transform boundaries where plates slide horizontally past one another. Evidence for plate tectonics includes matching fossil and rock formations between continents now separated by oceans, as well as variations in ancient climates that can be explained by past continental configurations.
Continental Drift Theory by Rajkumar
1. CONTINENTAL DRIFT
โFatherโ 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!!!)
Evidence... notes
1) Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since drifted apart.
2) Evidence supporting continental drift includes matching rock formations and fossil records found across separated continents, as well as similar fossils of tropical plants found in arctic regions, indicating past warmer climates.
3) The theory of plate tectonics emerged as scientists discovered that the ocean floors are formed through sea floor spreading at mid-ocean ridges, with the youngest rocks found at the ridges and increasing in age further away. This supported Wegener's theory that continents have moved over time.
Continental Drift Theory and Plate Tectonic
I am a student of SUST and my subject is "Geography & Environment". Topic of this presentation is " Continental Drift Theory and Plate Tectonic ".
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.
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.
Evidence... notes
1. Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since moved to their current locations.
2. Evidence such as matching rock formations and fossil distributions across continents supports continental drift. Fossils of the same plants and animals have been found on separated continents.
3. The theory of plate tectonics emerged in the 1950s with the discovery of seafloor spreading at ocean ridges, where new crust is formed and plates move apart, providing a mechanism for continental drift.
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.
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.
Time traveling alfred wegener essay
Alfred Wegener traveled through time to collect evidence to prove his theory of continental drift. He discovered that plate tectonics caused the continents to drift apart. Wegener found six key pieces of evidence to support continental drift: 1) the coastlines of continents fit together like puzzle pieces, 2) matching rock sequences and ages across continents, 3) matching diamond patterns across oceans, 4) mountain ranges torn apart by continental movement, 5) matching past glacier patterns, and 6) matching fossil distributions across continents. Wegener concluded that billions of years ago the continents were joined together in a supercontinent called Pangaea, which later broke apart due to plate tectonics.
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.
Continental drift theory by Alfred Wegener
1. The continental drift theory proposed that continents were once joined together in a single landmass called Pangaea, but have since drifted apart.
2. The theory was developed by Alfred Wegener in the early 1900s.
3. Wegener provided several lines of evidence to support the theory, including matching fossil distributions, mountain ranges, and coastlines across continents, as well as evidence that glaciers once extended to the equator.
Continental Drift Theory
This PPT takes a brief dig at the genesis of the Continental Drift Theory. It covers the causes and the evidences of the theory.
Plate tectonics
The document discusses plate tectonics and the evidence supporting continental drift. It describes how Wegener first proposed the hypothesis of continental drift in 1912 based on observations that the continents seemed to fit together. The document outlines several pieces of evidence that supported Wegener's hypothesis, including matching coastlines, shared fossil distributions, and geological and climatic similarities between separated continents. It then describes how the theory of seafloor spreading provided further evidence when studies in the 1940s and 1950s showed the ocean floor was younger than the continents and spreading occurred at mid-ocean ridges. Paleomagnetic data from the seafloor also supported seafloor spreading and continental drift. Today the theory of plate tectonics unifies
continental-drifting.pptx
The document summarizes the continental drift theory, which proposes that the Earth's continents were once joined together in a supercontinent called Pangaea before drifting apart. It discusses how Pangaea broke into Laurasia and Gondwanaland, and the evidence that supports the theory, including matching coastlines, matching fossil and rock formations found across oceans, deposits that require adjacent landmasses, and tillite glacial deposits found on separate continents. The theory explains that the lithosphere is made of plates that move due to convection currents in the mantle.
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.
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.
Continental Drift
1) Alfred Wegener proposed the theory of continental drift, which suggested that the continents were once joined together in a supercontinent called Pangaea before drifting apart over millions of years.
2) To support his theory, Wegener presented four pieces of evidence: the matching shapes of continental edges, identical fossil distributions, matching rock formations, and evidence of past climate zones that no longer align with the continents' current locations.
3) Despite this evidence, Wegener's contemporaries rejected his theory because he could not explain the mechanism that caused the continents to move. Acceptance of the theory required understanding how and why continental drift occurred.
Unit 4: Alfred Wegner & Harry Hess
Alfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later, Harry Hess confirmed Wegenerโs ideas by using the evidence of seafloor spreading to explain what moved the continents.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
science report
Alfred Wegener first proposed the theory of continental drift in 1912. He suggested that the continents were once joined together in a supercontinent called Pangaea, which later broke apart and drifted to their current positions. Wegener's theory was initially rejected by many scientists. However, the theory of plate tectonics later provided a mechanism - seafloor spreading - that explained how the continents could move over time. Today, the movement of continents via plate tectonics is well established in the scientific community.
Continental-Drift.ppt
Geologist Alfred Wegener first proposed the theory of continental drift in 1912. He noticed that the continents seemed to fit together and referred to their original combined landmass as Pangaea. Wegener presented evidence that included matching fossil records, rock formations, mountain ranges, glacial scours, and coal deposits found across separated continents. However, his theory was initially rejected because the idea of continental movement and an old Earth was difficult for many to accept at the time. It was not until the 1960s when additional evidence from studies of the ocean floor supported plate tectonics that continental drift was more widely accepted.
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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.
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.
Evidence... notes
1. Alfred Wegener first proposed the theory of continental drift in 1912, suggesting that the continents were once joined together in a supercontinent called Pangaea and have since moved to their current locations.
2. Evidence such as matching rock formations and fossil distributions across continents supports continental drift. Fossils of the same plants and animals have been found on separated continents.
3. The theory of plate tectonics emerged in the 1950s with the discovery of seafloor spreading at ocean ridges, where new crust is formed and plates move apart, providing a mechanism for continental drift.
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.
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.
Time traveling alfred wegener essay
Alfred Wegener traveled through time to collect evidence to prove his theory of continental drift. He discovered that plate tectonics caused the continents to drift apart. Wegener found six key pieces of evidence to support continental drift: 1) the coastlines of continents fit together like puzzle pieces, 2) matching rock sequences and ages across continents, 3) matching diamond patterns across oceans, 4) mountain ranges torn apart by continental movement, 5) matching past glacier patterns, and 6) matching fossil distributions across continents. Wegener concluded that billions of years ago the continents were joined together in a supercontinent called Pangaea, which later broke apart due to plate tectonics.
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.
Continental drift theory by Alfred Wegener
1. The continental drift theory proposed that continents were once joined together in a single landmass called Pangaea, but have since drifted apart.
2. The theory was developed by Alfred Wegener in the early 1900s.
3. Wegener provided several lines of evidence to support the theory, including matching fossil distributions, mountain ranges, and coastlines across continents, as well as evidence that glaciers once extended to the equator.
Continental Drift Theory
This PPT takes a brief dig at the genesis of the Continental Drift Theory. It covers the causes and the evidences of the theory.
Plate tectonics
The document discusses plate tectonics and the evidence supporting continental drift. It describes how Wegener first proposed the hypothesis of continental drift in 1912 based on observations that the continents seemed to fit together. The document outlines several pieces of evidence that supported Wegener's hypothesis, including matching coastlines, shared fossil distributions, and geological and climatic similarities between separated continents. It then describes how the theory of seafloor spreading provided further evidence when studies in the 1940s and 1950s showed the ocean floor was younger than the continents and spreading occurred at mid-ocean ridges. Paleomagnetic data from the seafloor also supported seafloor spreading and continental drift. Today the theory of plate tectonics unifies
continental-drifting.pptx
The document summarizes the continental drift theory, which proposes that the Earth's continents were once joined together in a supercontinent called Pangaea before drifting apart. It discusses how Pangaea broke into Laurasia and Gondwanaland, and the evidence that supports the theory, including matching coastlines, matching fossil and rock formations found across oceans, deposits that require adjacent landmasses, and tillite glacial deposits found on separate continents. The theory explains that the lithosphere is made of plates that move due to convection currents in the mantle.
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.
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.
Continental Drift
1) Alfred Wegener proposed the theory of continental drift, which suggested that the continents were once joined together in a supercontinent called Pangaea before drifting apart over millions of years.
2) To support his theory, Wegener presented four pieces of evidence: the matching shapes of continental edges, identical fossil distributions, matching rock formations, and evidence of past climate zones that no longer align with the continents' current locations.
3) Despite this evidence, Wegener's contemporaries rejected his theory because he could not explain the mechanism that caused the continents to move. Acceptance of the theory required understanding how and why continental drift occurred.
Unit 4: Alfred Wegner & Harry Hess
Alfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later, Harry Hess confirmed Wegenerโs ideas by using the evidence of seafloor spreading to explain what moved the continents.
Register to explore the whole course here: https://school.bighistoryproject.com/bhplive?WT.mc_id=Slideshare12202017
science report
Alfred Wegener first proposed the theory of continental drift in 1912. He suggested that the continents were once joined together in a supercontinent called Pangaea, which later broke apart and drifted to their current positions. Wegener's theory was initially rejected by many scientists. However, the theory of plate tectonics later provided a mechanism - seafloor spreading - that explained how the continents could move over time. Today, the movement of continents via plate tectonics is well established in the scientific community.
Continental-Drift.ppt
Geologist Alfred Wegener first proposed the theory of continental drift in 1912. He noticed that the continents seemed to fit together and referred to their original combined landmass as Pangaea. Wegener presented evidence that included matching fossil records, rock formations, mountain ranges, glacial scours, and coal deposits found across separated continents. However, his theory was initially rejected because the idea of continental movement and an old Earth was difficult for many to accept at the time. It was not until the 1960s when additional evidence from studies of the ocean floor supported plate tectonics that continental drift was more widely accepted.
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๐๐ข๐ฌ๐๐ฎ๐ฌ๐ฌ ๐ญ๐ก๐ ๐๐๐ ๐๐ฎ๐ซ๐ซ๐ข๐๐ฎ๐ฅ๐ฎ๐ฆ ๐ข๐ง ๐ญ๐ก๐ ๐๐ก๐ข๐ฅ๐ข๐ฉ๐ฉ๐ข๐ง๐๐ฌ:
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๐๐ฑ๐ฉ๐ฅ๐๐ข๐ง ๐ญ๐ก๐ ๐๐๐ญ๐ฎ๐ซ๐ ๐๐ง๐ ๐๐๐จ๐ฉ๐ ๐จ๐ ๐๐ง ๐๐ง๐ญ๐ซ๐๐ฉ๐ซ๐๐ง๐๐ฎ๐ซ:
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- 1. PLATE TECTONICS GROUP III EARTH SCIENCE
- 2. OBJECTIVE ๏ผ Discuss some of the evidence of the continental drift and the role of Alfred Wegener in promoting this theory. At the end of the discussion the students will be able to;
- 4. CONTINENTAL DRIFT THEORY ๏ผ ๏ผ ๏ผ The continental drift hypothesis was developed by mostly Alfred Wegener in the early part of 20th century. He said that the continents move around the Earthโs surface and they were once joined together as a single super continent. Continents can be piece together like a jigsaw puzzle. ๏ผ ๏ผ In ancient Greek it means all Earth Continent were once united as a single supercontinent.
- 5. EVIDENCE OF CONTINENTAL DRIFT 1. Rocks and mountain rages - Mountain rages with the same rock types, structures, and age are now on the opposite side of Atlantic oceans. Ex. Appalachians of easter United States and Canada are just like the mountain rages in the eastern Greenland, Ireland, Great Britain, and Norway.
- 6. A. B.
- 7. EVIDENCE OF CONTINENTAL DRIFT 2. Distribution of ancient fossils - Ancient fossils of the same species of extinct plants and animals are found in rocks of the same age but on the continent that are now widely separated.
- 8. ๏ผ ๏ผ ๏ผ Fossils of the seed fern Glossepteris were too heavy to be carried so far by wind. Mesosaurus a swimming reptile but could only swim at fresh water. Cynognathus & Lystrosaurus Land reptiles and were unable to swim at fresh water
- 9. EVIDENCE OF CONTINENTAL DRIFT โข โข โข 3. Locations of ancient climatic zones Grooves & Rock deposits left by ancient glacier are found today on different continents very close to the equator. Glacier either formed in the middle of the oceans or cover most of the Earth. Wegener thought that glacier were centered over the southern part of land mass close to south pole and the continents moves to their current position.