The first sort of plate boundary is called a divergent boundary, or spreading center. At these boundaries, two plates move away from one another. As the two move apart, mid-ocean ridges are created as magma from the mantle upwells through a crack in the oceanic crust and cools.
scign.jpl.nasa.gov/learn/plate4.htm scign.jpl.nasa.gov/learn/plate4.htm
Explore divergent, convergent and transform plate boundaries with satellite images and maps. Use the buttons in the upper left to navigate and change your zoom level. To navigate just grab the image and drag it around. ... Divergent Boundary...
geology.com/plate-tectonics.shtml geology.com/plate-tectonics.shtml
Divergent Plate Boundary - Oceanic: (see illustration above) When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere producing a mid-ocean ridge. Extensional forces stretch the lithosphere and produce a deep fissure.
geology.com/nsta/divergent-plate-boundaries.shtml geology.com/nsta/divergent-plate-boundaries.shtml
Plate tectonics - Wikipedia, the free encyclopedia
Plate tectonics (from the Greek τέκτων; tektōn , meaning "builder" or "mason") is a theory which describes the large scale motions of Earth's lithosphere. The theory builds on the older concepts of...
en.wikipedia.org/wiki/Plate_tectonics
plate armor ... plate binding ... plate glass...
encarta.msn.com/dictionary_1861732713/plate_boundary.ht... encarta.msn.com/dictionary_1861732713/plate_boundary.html
Artist's cross section illustrating the main types of plate boundaries (see text); East African Rift Zone is a good example of a continental rift zone. ... "Understanding plate motions"
pubs.usgs.gov/publications/text/Vigil.html
plate tectonics n. (used with a sing. verb) A theory that explains the global distribution of geological phenomena such as seismicity, volcanism ... All these ideas, and many more, are encompassed in the concept of plate tectonics, which is the name for a branch of geologic and geophysical study and for a powerful theory...
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This occurs where two plates collide with one another. Transform boundaries occur where plates are grinding past one another, like the San Andreas fault. Plate boundary zones are broad belts in which boundaries are not well defined and the effects of plate interaction are unclear.
www.uwsp.edu/geo/faculty/ritter/geog101/textbook/tecton... www.uwsp.edu/geo/faculty/ritter/geog101/textbook/tectonics_landforms/tectonics_plate_boundary_types.html
Convergent Boundary ... Pacific Plate ... North American Plate...
www.classzone.com/books/earth_science/terc/content/visu... www.classzone.com/books/earth_science/terc/content/visualizations/es0804/es0804page01.cfm?chapter_no=visualization