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Evolution of the Ocean Basins
Evolution of the Ocean Basins

... Shrinking & Young uplift mountains Shrinking & Young uplift mountains ...
Name Class Date ______ Chapter 9 Plate Tectonics Study Guide
Name Class Date ______ Chapter 9 Plate Tectonics Study Guide

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Plate Tectonics - DuBois Area School District
Plate Tectonics - DuBois Area School District

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Evolution of continents, cratons and supercontinents: building the
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Plate Tectonics PowerPoint
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... Wegener suggested that all the continents were joined together at some time in the past. In 1912, he proposed the hypothesis of continental drift.  According to this hypothesis, continents have moved slowly to their current locations.  He suggested that all continents once were connected as one la ...
Unit 3: Lesson 2: Theory of Plate Tectonics
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Ch 12.1
Ch 12.1

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chapter 15A - plate tectonics 1
chapter 15A - plate tectonics 1

... ridges) that circle the globe, often parallel to continental boundaries – dredging of sea floor sediment and rocks indicated the age of the oldest ocean crust was much younger than that of continental crust. – Recurring patterns of earthquakes and volcanoes in places such as the Circum-Pacific Belt ...
1 - Ridgefield School District
1 - Ridgefield School District

... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
Plate Tectonics - bvsd.k12.pa.us
Plate Tectonics - bvsd.k12.pa.us

... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
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Supercontinent



In geology, a supercontinent is the assembly of most or all of the Earth's continental blocks or cratons to form a single large landmass. However, the definition of a supercontinent can be ambiguous. Many tectonicists such as P.F. Hoffman (1999) use the term ""supercontinent"" to mean ""a clustering of nearly all continents"". This definition leaves room for interpretation when labeling a continental body and is easier to apply to Precambrian times. Using the first definition provided here, Gondwana (aka Gondwanaland) is not considered a supercontinent, because the landmasses of Baltica, Laurentia and Siberia also existed at the same time but physically separate from each other. The landmass of Pangaea is the collective name describing all of these continental masses when they were in a close proximity to one another. This would classify Pangaea as a supercontinent. According to the definition by Rogers and Santosh (2004), a supercontinent does not exist today. Supercontinents have assembled and dispersed multiple times in the geologic past (see table). The positions of continents have been accurately determined back to the early Jurassic. However, beyond 200 Ma, continental positions are much less certain.
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