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Mostly it's about the Plate Tectonics and its contribution to our Earth's Formation and speculation of what may happen next.
In this movie, National Geographic explained, in more detail, what we have learned in science class about geography. We didn't really learn a lot about the Creation of Earth but there's a lot about it in here. Earth was created by the explosion of a star. Pieces of the star floated around in space and crashed into each other thus creating the first base of Earth. Earth didn't have any water then or atleast until asteroids with water crashed onto Earth's surface thus creating the ocean though it was one at the time.
The Early Earth Blasted by Asteroids |
The Rock Cycle |
I am very much interested in the first Super-Continents. It's fascinating; the way Earth was created, the long period of time that it took to actually come to be as it is now, the forming of the layers and most importantly the first super-continents themselves. Sutton in 1963 was the first to ever come close to formulate a super-continent cycle. His chelogenic cycles were about continents clustering together irregularly however it was a bit wrong. The Theory of Tectonic episodicity was supported by Wilson in 1966 and is now known as the Wilson Cycles. Hallam in 1974 showed how sea levels were connected to this. Now, Super-continents are continents smashed together to put it simply. The landmass of Europe, Africa and Asia is a super-continent. America is also arguably one. The most recent supercontinent and also the most known one is Pangaea. People forget that Pangaea is merely the latest of a line of supercontinents. We'll start from the begining. First cratons [large giant rock cores] rose up on the surface.
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Timeline of SuperContinents |
The video was excellent. It is especially good for someone who is studying Geology and mostly for students and teachers. In fact, it has more detail than textbooks and it has information from geologists. It has extremely reliable information and facts. And it explained many concepts and then used to reason what happens in Geology.
It started from the begining of Earth and ended at the Geological future of Earth. The movie also had good graphics that showed what they were trying to say though it could use more improvement. It had certain images that were not obvious as would have been best. This movie was a detailed summary by National Geographic for me.
Link to MindMap: https://docs.google.com/a/rism.ac.th/drawings/d/1fcR92RU12XY3VADe7-nQNAZqfMdNlwzIWX6rgjRKSSk/edit?usp=sharing
Sources:
-Wilkins, Alasdair. "A History of Supercontinents on Planet Earth." Io9. N.p., 27 Jan. 2011. Web. 03 Nov. 2014. <http://io9.com/5744636/a-geological-history-of-supercontinents-on-planet-earth>
-Nance, R.Damian, and J.Brendan Murphy. "Origins of the Supercontinent Cycle." Science Direct. China University of Geosciences (Beijing) and Peking University. Production and Hosting by Elsevier B.V, 8 Jan. 2013. Web. 07 Nov. 2014. <http://www.sciencedirect.com/science/article/pii/S1674987112001570>.
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