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| | Plate tectonics - Psychology Central (Site not responding. Last check: 2007-10-26) |
 | | Plate tectonics (from the Greek word for "one who constructs and destroys", τεκτων, tekton) is a theory of geology developed to explain the phenomenon of continental drift and is currently the theory accepted by the vast majority of scientists working in this area. |
 | | These plates (and the more numerous minor plates) move in relation to one another at one of three types of plate boundaries: convergent (or destructive, two plates push against one another), divergent (or constructive, two plates move away from each other), and transform (two plates slide past one another). |
 | | Plate tectonic theory arose out of two separate geological observations: continental drift, noticed in the early 20th century, and seafloor spreading, noticed in the 1960s. |
| psychcentral.com /psypsych/Tectonic (4311 words) |
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