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1 http://www.pbs.org/wgbh/aso/tryit/tectonics/intro. html

2 ~ In 1912 Alfred Wegener noticed that the continents fir together like a puzzle and the continents once compressed in a protocontinent which he called Pangaea. ~ Scientists did not the theory of a ‘super continent’ because the wasn’t much proof to support Wegener's theory. He didn’t have an explanation for why the continents moved. ~ Pangaea means all lands. Pangaea occurred in late carboniferous time about 300 million years ago, the continents started to break up and drift apart ~ The “contraction theory” which suggested that the planet was once a molten ball and in the process of cooling the surface cracked and folded up on itself, was being discusses when Wegener introduced Pangaea. ~ Wegener had a PH.D in astronomy. This relates to his discoveries because he atmosphere can fit together like a puzzle just like the continents. ~ Arthur Holmes elaborated on Wegener's hypothesis that “The mantle undergoes thermal convection. The theories relate because if a substance is heated up it will rise the surface until it cools and this can beak apart a continent http://www.ucmp.berkeley.edu/history/w egener.html

3 http://www.google.com/imgres?imgurl=h ttp://earthguide.ucsd.edu Pangaea pictures! Alfred Wegener

4 ~ Convergent boundaries are places where plates crash or crunch together. ~ Earthquakes, volcanoes, trenches, mountains, mud/land slides, etc, are characteristics of a convergent boundaries. ~ An example of a convergent boundaries is on the west coast of South America where a oceanic Nazca Plate is crushing into South America. The crash formed the Andes Mts., a long stream of volcanoes, and a deep trench. http://geology.com/articles/supercontine nt.shtml

5 ~ Divergent Boundaries are places where plates are coming apart. ~ Earthquakes, mountains, and volcanoes, form in the characteristics of a divergent boundary. ~ An example is in the east Africa rift in Kenya and Ethiopia, and the Rio Grande rift in New Mexico. A divergent Boundary crosses the ocean floor the rift valley is much narrower. It runs along the top of a midoceanic ridge. http://www.cotf.edu/ete/modules/ms ese/earthsysflr/plates2.html

6 ~ Transform Boundaries are places where plates slide past each other. ~ Earthquakes, and Volcanoes are hazard characteristics for a transform boundary. ~ An example of a Transform Boundary is the San Andrea’s Fault the slice of California to the wet of the fault is slowly moving north relative to the rest of California. http://geology.com/articles/supercontine nt.shtml

7 Geology.com Pate Tectonic Map ~ We are located on the North American plate ~ The North American, Pacific Plate, Eurasian plate, Nazca Plate, South American Plate, and the African Plate border or contain the united states. ~ The San Andreas fault, The slice of California to the west of the fault is slowly moving north relative to the rest of California. ~ I predict that the plates will keep on moving and connect again but on there other sides in the distant future.


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