Continental Drift Theory Template

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The document discusses the continental drift theory proposed by Alfred Wegener in the early 1900s. It provides evidence that Wegener used to support his theory, including matching landforms between continents, identical fossil finds in separated continents, and plant fossils found in unexpected locations. It also discusses Harry Hess and his theory of sea floor spreading, which helped explain continental drift. Hess proposed that new material is added at mid-ocean ridges, evidenced by older rocks found farther from ridges.

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Earth and Life Science Earth Materials and Processes Deformation of the Crust: Continental Drift Theory Learning Competencies The learners shall be able to explain how the continents drift (S11/12ESId-20), and cite evidence that support continental drift (S11/12ES-Id-21). Specific Learning Outcomes At the end of the lesson, the learners will be able to: 1. Discuss the history behind the Theory of Continental Drift; 2. Describe the Continental Drift Theory; and 3. Enumerate and explain the evidence used to support the idea of drifting continents.

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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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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!!!)

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