History of the World (the short version) Chap 7 Intro.
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Transcript of History of the World (the short version) Chap 7 Intro.
![Page 1: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/1.jpg)
History of the World(the short version)
Chap 7 Intro
![Page 2: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/2.jpg)
Age of Earth
• 4.54 billion years (+/- 1%)
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Continental Drift
• Proposed by Alfred Wegener 1915
• Continents formed one landmass in the past—Pangea
• Began breaking apart 200 mill years ago
• Have been moving slowly ever since, now in present position
![Page 4: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/4.jpg)
![Page 5: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/5.jpg)
![Page 6: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/6.jpg)
![Page 7: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/7.jpg)
What evidence did Wegener have?
• Rock Formations– Similar rock types in areas that had been close
together
• Fossils– Similar animal & plant fossils where plates had been
together
• Climate Evidence– Coal deposits in Antarctica– Glacial deposits in Africa, India, Australia & So.
America
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![Page 9: History of the World (the short version) Chap 7 Intro.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfa21a28abf838c95eb0/html5/thumbnails/9.jpg)
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or Pangea Ultimata (250 Ma)
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When Plates Meet
• Divergent Boundary: plates move apart; cause sea floor spreading at rift valleys. Mid-Atlantic Ridge
• Convergent Boundary (Subduction): one plate slides beneath another; forms small mountains, volcanoes. Mt. St. Helens, Andes
• Collision Boundary: Plates slide together, forced upward. Forms large mountain chains. Alps, Himalayans, Appalachia
• Transform Boundary: faults slide along side one another. San Andreas Fault
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• You Try It Plate Tectonics
• Plate Boundary Animation
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The untold tragedies of Continental Drift