Continental-Drift.ppt
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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 and continental drift was widely accepted.
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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.
Continental-Drift_PPT-Lecture-1-Autosaved.pptx
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. The theory proposed that the continents were once joined together but have since drifted apart.
Supporting evidence included matching fossil and rock formations between continents, as well as evidence that mountain ranges and glacial scars on separate continents aligned when the continents were fitted together. Exploration of the seafloor in the 1960s provided further evidence, revealing mid-ocean ridges and magnetic stripe patterns that supported the new theory of seafloor spreading, where new crust is formed at ocean ridges and pushes existing crust apart over geologic time.
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 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
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.
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!!!)
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.
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.
Continental-Drift_PPT-Lecture-1-Autosaved.pptx
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. The theory proposed that the continents were once joined together but have since drifted apart.
Supporting evidence included matching fossil and rock formations between continents, as well as evidence that mountain ranges and glacial scars on separate continents aligned when the continents were fitted together. Exploration of the seafloor in the 1960s provided further evidence, revealing mid-ocean ridges and magnetic stripe patterns that supported the new theory of seafloor spreading, where new crust is formed at ocean ridges and pushes existing crust apart over geologic time.
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 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
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.
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!!!)
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.
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.
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.
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 Notes - Jenny
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a single landmass called Pangaea that has since drifted apart. Wegener provided evidence from matching coastlines, fossil distributions, and climate patterns from over 250 million years ago to support his hypothesis. However, his theory was rejected by the scientific community at the time due to the lack of a proposed mechanism for continental movement and because it contradicted established ideas about mountain formation and Earth's cooling history. Continental drift was not widely accepted until new evidence emerged in the 1950s.
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
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.
The Continental Drift and Seafloor Spreading Theory
Geologist Alfred Wegener noticed that fossils and rock formations found on different continents seemed to match up and fit together, as if the continents had once been joined together. He proposed that all the continents were once part of a single supercontinent, which he called Pangaea. Wegener observed similar mountain ranges, glacial deposits, and plant and animal fossil remains on continents now separated by oceans, providing evidence for his theory of continental drift and the existence of the ancient supercontinent Pangaea.
Continental Drift Theory
Alfred Wegener was a German scientist born in 1880 who developed the theory of continental drift, which proposed that the continents were once joined together in a supercontinent called Pangaea. He provided evidence from matching continental coastlines, fossil distributions, and past climates to support his hypothesis. Harry Hess was an American geologist born in 1906 who helped develop the theory of plate tectonics, proposing that the Earth's lithosphere is broken into rigid plates that move over Earth's surface. He contributed the idea of seafloor spreading to explain how new oceanic crust is formed at mid-ocean ridges. The theory of plate tectonics eventually subsumed and expanded upon Wegener's idea of continental drift
Plate Tectonics Part1
The document summarizes the scientific revolution of plate tectonics theory. It describes how early evidence from matching continents, glacial patterns, and fossils was initially dismissed. By the 1950s-1960s, accumulating seafloor mapping data and discoveries like magnetic striping and Benioff zones provided strong evidence that was widely accepted by the late 1960s, establishing plate tectonics as the new geological paradigm.
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 Wegener’s 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
Continental drift
1) Early scientists like Bacon and Snider-Pellegrini noticed similarities between continents like Africa and South America, but it was Wegener who first proposed the theory of continental drift in 1915.
2) Evidence for continental drift includes matching coastlines, similarities in fossils found on different continents, matching rock types along coastlines, and geological features lining up across continents.
3) In the mid-20th century, discoveries of seafloor spreading and plate tectonics provided the mechanism of plate tectonics to explain continental drift, with ocean floors being created at mid-ocean ridges and spreading outward over time.
Ch.5.less.2.what happens when earth plates move
German geologist Alfred Wegener proposed the theory of continental drift in 1912, which hypothesized that the continents were once joined together in a single landmass called Pangaea before drifting apart to their current locations. Wegener provided three key pieces of evidence to support this: the continental margins fit together like puzzle pieces, matching fossil and rock formations were found on separated continents, and the same fossils of non-marine animals were discovered on continents far apart. Later, scientists developed the theory of plate tectonics to explain the forces causing the continental drift, proposing that movements in underground plates pushed the continents apart or together.
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.
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.
Continental driftnotes
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a supercontinent called Pangaea before slowly drifting apart. Wegener provided geological evidence from matching coastlines, fossil distributions, and past climate patterns to support his hypothesis. However, his theory was rejected by most geologists of the time due to the lack of a proposed mechanism for continental movement and challenges to established geological theories. It was not until the 1950s, when new evidence emerged about plate tectonics, that Wegener's hypothesis of continental drift was more widely accepted.
evidences_plate.ppt
1. In 1912, Alfred Wegener proposed the continental drift theory which hypothesized that around 200 million years ago, all the continents were joined together in a supercontinent called Pangaea which later broke apart.
2. Evidence from fossils of the same plants and animals found across continents now separated by oceans, matching rock formations, and coal deposits provided support for continental drift.
3. In the 1960s, the theory of seafloor spreading was developed which helped explain continental drift as new ocean crust is formed at mid-ocean ridges and pushed continents apart.
Ch.5.less.2.what happens when earth plates move
Wegener's continental drift hypothesis from 1912 proposed that the continents were once joined together in a single landmass called Pangaea, which later broke apart and drifted to their current positions. He provided three types of evidence to support this: the continental margins fit together like puzzle pieces; matching fossil distributions of non-marine species on separated continents; and identical rock formations and mountain ranges on different continents. Later, the plate tectonics theory emerged to explain the forces driving continental drift, stating that movements of tectonic plates caused by convection currents in the mantle push and pull the continents. There are three types of plate boundary movements - divergent boundaries cause plates to separate and oceans to widen, convergent boundaries cause
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.
Contenental drift theory by Anurag Yadav
The theory of continental drift proposed by Alfred Wegener in 1912 attempted to explain how continents shift positions over geologic time. It suggested that continents were once joined together in a supercontinent called Pangaea before drifting apart. Wegener's theory was rejected by scientists at the time due to lack of evidence for what forces could move continents. It was not widely accepted until the 1960s when seafloor spreading was discovered, providing a mechanism to explain continental drift through plate tectonics.
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
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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.
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.
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 Notes - Jenny
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a single landmass called Pangaea that has since drifted apart. Wegener provided evidence from matching coastlines, fossil distributions, and climate patterns from over 250 million years ago to support his hypothesis. However, his theory was rejected by the scientific community at the time due to the lack of a proposed mechanism for continental movement and because it contradicted established ideas about mountain formation and Earth's cooling history. Continental drift was not widely accepted until new evidence emerged in the 1950s.
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
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.
The Continental Drift and Seafloor Spreading Theory
Geologist Alfred Wegener noticed that fossils and rock formations found on different continents seemed to match up and fit together, as if the continents had once been joined together. He proposed that all the continents were once part of a single supercontinent, which he called Pangaea. Wegener observed similar mountain ranges, glacial deposits, and plant and animal fossil remains on continents now separated by oceans, providing evidence for his theory of continental drift and the existence of the ancient supercontinent Pangaea.
Continental Drift Theory
Alfred Wegener was a German scientist born in 1880 who developed the theory of continental drift, which proposed that the continents were once joined together in a supercontinent called Pangaea. He provided evidence from matching continental coastlines, fossil distributions, and past climates to support his hypothesis. Harry Hess was an American geologist born in 1906 who helped develop the theory of plate tectonics, proposing that the Earth's lithosphere is broken into rigid plates that move over Earth's surface. He contributed the idea of seafloor spreading to explain how new oceanic crust is formed at mid-ocean ridges. The theory of plate tectonics eventually subsumed and expanded upon Wegener's idea of continental drift
Plate Tectonics Part1
The document summarizes the scientific revolution of plate tectonics theory. It describes how early evidence from matching continents, glacial patterns, and fossils was initially dismissed. By the 1950s-1960s, accumulating seafloor mapping data and discoveries like magnetic striping and Benioff zones provided strong evidence that was widely accepted by the late 1960s, establishing plate tectonics as the new geological paradigm.
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 Wegener’s ideas by using the evidence of seafloor spreading to explain what moved the continents.
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Continental drift
1) Early scientists like Bacon and Snider-Pellegrini noticed similarities between continents like Africa and South America, but it was Wegener who first proposed the theory of continental drift in 1915.
2) Evidence for continental drift includes matching coastlines, similarities in fossils found on different continents, matching rock types along coastlines, and geological features lining up across continents.
3) In the mid-20th century, discoveries of seafloor spreading and plate tectonics provided the mechanism of plate tectonics to explain continental drift, with ocean floors being created at mid-ocean ridges and spreading outward over time.
Ch.5.less.2.what happens when earth plates move
German geologist Alfred Wegener proposed the theory of continental drift in 1912, which hypothesized that the continents were once joined together in a single landmass called Pangaea before drifting apart to their current locations. Wegener provided three key pieces of evidence to support this: the continental margins fit together like puzzle pieces, matching fossil and rock formations were found on separated continents, and the same fossils of non-marine animals were discovered on continents far apart. Later, scientists developed the theory of plate tectonics to explain the forces causing the continental drift, proposing that movements in underground plates pushed the continents apart or together.
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.
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.
Continental driftnotes
Alfred Wegener first proposed the theory of continental drift in 1915, suggesting that the continents were once joined together in a supercontinent called Pangaea before slowly drifting apart. Wegener provided geological evidence from matching coastlines, fossil distributions, and past climate patterns to support his hypothesis. However, his theory was rejected by most geologists of the time due to the lack of a proposed mechanism for continental movement and challenges to established geological theories. It was not until the 1950s, when new evidence emerged about plate tectonics, that Wegener's hypothesis of continental drift was more widely accepted.
evidences_plate.ppt
1. In 1912, Alfred Wegener proposed the continental drift theory which hypothesized that around 200 million years ago, all the continents were joined together in a supercontinent called Pangaea which later broke apart.
2. Evidence from fossils of the same plants and animals found across continents now separated by oceans, matching rock formations, and coal deposits provided support for continental drift.
3. In the 1960s, the theory of seafloor spreading was developed which helped explain continental drift as new ocean crust is formed at mid-ocean ridges and pushed continents apart.
Ch.5.less.2.what happens when earth plates move
Wegener's continental drift hypothesis from 1912 proposed that the continents were once joined together in a single landmass called Pangaea, which later broke apart and drifted to their current positions. He provided three types of evidence to support this: the continental margins fit together like puzzle pieces; matching fossil distributions of non-marine species on separated continents; and identical rock formations and mountain ranges on different continents. Later, the plate tectonics theory emerged to explain the forces driving continental drift, stating that movements of tectonic plates caused by convection currents in the mantle push and pull the continents. There are three types of plate boundary movements - divergent boundaries cause plates to separate and oceans to widen, convergent boundaries cause
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.
Contenental drift theory by Anurag Yadav
The theory of continental drift proposed by Alfred Wegener in 1912 attempted to explain how continents shift positions over geologic time. It suggested that continents were once joined together in a supercontinent called Pangaea before drifting apart. Wegener's theory was rejected by scientists at the time due to lack of evidence for what forces could move continents. It was not widely accepted until the 1960s when seafloor spreading was discovered, providing a mechanism to explain continental drift through plate tectonics.
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
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The Continental Drift and Seafloor Spreading Theory
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Continental-Drift.ppt
- 2. Alfred L. Wegener Geologist Alfred Wegener noticed similar rocks & fossil remains were found on continents which seemed to fit together He called this “super” continent called Pangaea In 1912 Wegener published the first version & died defending his theory
- 3. PANGAEA the large landmass that included all of Earth’s present day continents
- 4. Support for Continental Drift 1. SHAPE OF THE CONTINENTS Continents fit together like puzzle pieces
- 5. Support for Continental Drift Wegener was not the only one to notice the fit of the continents. 1858: Antonio Pelligrini depicted Africa and South America connected. He was one of the first scientists to publish maps depicting the apparent fit of the continents. 1. SHAPE OF THE CONTINENTS
- 6. Mesosaurus was incapable of swimming across a large ocean. 2. FOSSIL EVIDENCE SAME FOSSILS: DIFFERENT CONTINENTS Support for Continental Drift
- 7. 3. ROCK EVIDENCE – Mountain ranges Support for Continental Drift SAME ROCK: DIFFERENT RANGE Existing mountain ranges separated by vast oceans contain rocks of identical mineral content. A prime example are the Appalachian Mountains in the eastern U.S and the Caledonian Mountains in the British Isles.
- 8. SAME SCARS: DIFFERENT CONTINENTS Support for Continental Drift 4. GLACIAL SCARS
- 9. 5. LOCATION OF COAL DEPOSITS Coal deposits have been found in temperate and polar regions; however, coal is formed in tropical regions. Support for Continental Drift
- 10. CONTINENTAL DRIFT IN DOUBT Why didn’t people believe in continental drift? People couldn’t image how the earth could be millions of years old People couldn’t image a force great enough to move the continents BUT by the 1960’s evidence would prove continental drift is TRUE and…. The story continues (as does all good science!)