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Landforms--Plate Tectonics

Landforms--Plate Tectonics. Forces that Build. Why is the earth’s surface so dynamic in contrast to the Moon?. Tectonic forces/Gradational forces. Abraham Ortelius-1564-’Theatre of the World’.

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Landforms--Plate Tectonics

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  1. Landforms--Plate Tectonics Forces that Build

  2. Why is the earth’s surface so dynamicin contrast to the Moon?

  3. Tectonic forces/Gradational forces

  4. Abraham Ortelius-1564-’Theatre of the World’

  5. Abraham Ortelius in his work Thesaurus Geographicus ... suggested that the Americas were "torn away from Europe and Africa ... by earthquakes and floods" and went on to say: "The vestiges of the rupture reveal themselves, if someone brings forward a map of the world and considers carefully the coasts of the three [continents]."

  6. 18th Century World Map-the ‘Jigsaw Earth’ becomes clearer

  7. fossil evidence

  8. Original explanation of species dispersal—land bridges??

  9. What is so strange about coal being discovered in Antartica?How can it be explained?

  10. Alfred Wegener-1911-German meteorologist/Theory of Continental Drift

  11. Pangaea-225 million years ago

  12. Mid-Atlantic Ridge-confirmed 1950s

  13. New Oceanic Crust forming

  14. Iceland at the Ridge

  15. One of Iceland’s many active geysers

  16. On the Move!

  17. The Earth's magnetic field is slowly changing and appears to have been changing throughout its existence. When the tectonic plates form along the oceanic ridges, the magnetic field that exists is imprinted on the rock as they cool. The slowly moving plates act as a kind of a recorder leaving information about the strength and direction of past magnetic fields. By sampling these rocks and using radiometric dating techniques it has been possible to reconstruct the history of the Earth's magnetic field for the last 160 million years or so. Older "paleomagnetic" data exists but the picture is less continuous. An interlocking body of evidence, from many locations and times, give paleomagnetists confidence that these data are revealing a correct picture of the Earth's plate motions. In addition, if one "plays this tape backwards" the continents, which ride on the tectonic plates, reassemble along their edges with near perfect fits. These "reassembled continents" have matching fossil floras and faunas.

  18. Polarity/Sea-floor Spreading-1960s

  19. Earth’s layers as a hard-boiled egg!

  20. Lithosphere/Asthenosphere

  21. Convection within the earth

  22. The wafer-like crust floats on a choc. pudding consistency

  23. There are 4 types of plate interactions. Each will have a different effect on landforms.1. Divergence2. Sideswipe (Transform boundary)3. Convergence4. Hot spots

  24. Earthquakes-last 8 days

  25. “The quake hit San Francisco on Wednesday, April 18, at precisely 12 minutes past five o'clock in the morning. But San Francisco wasn't the only place to get hit… In San Jose, 8000 people were homeless. Santa Rosa, a town of 7000, was leveled. Trees were uprooted. Fences curved. And in some place the earth flowed like water. The quake had the impact of six million tons of TNT or roughly 12,000 times the power of the atomic bomb exploded over Hiroshima. It remains the greatest natural disaster suffered by a North American city.

  26. I shouldn't wonder if San Francisco had sunk. That was some earthquake. We don't know but the Atlantic may be washing up at the feet of the Rocky Mountains!" ---Jack London

  27. Transform Boundaries—A sideswipe

  28. Caribbean Plate interactions

  29. Fault line through Haiti

  30. East Africa Rift Zone

  31. African Rift

  32. Effects of this triple junction on Europe/The Middle East?

  33. Vesuvius Victims-79 CE

  34. Mount Vesuvius

  35. African and Eurasian collision causing Italy’s volcanoes

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