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Topic: Divergent boundary

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	Plate Tectonics - Printer-friendly - MSN Encarta
		The second kind of motion, called relative motion, leads to different types of boundaries between plates: plates moving apart from one another form a divergent boundary, plates moving toward one another form a convergent boundary, and plates that slide along one another form a transform plate boundary.
		Divergent boundaries on land cause rifting, in which broad areas of land are uplifted, or moved upward.
		As a transform plate boundary cuts perpendicularly across the edges of the continental crust near the borders of the continental and oceanic crust, the result is a system such as the San Andreas transform fault system in California.
	encarta.msn.com /text_761554623___7/Plate_Tectonics.html (1473 words)

	Plate Tectonic Theory: Plates and Interplate Relationships
		Note the line under the craton; that is the lower boundary of the lithosphere, and is the bottom boundary of the plate.
		Two divergent margins (plate boundaries) are present in the cross section: one labeled as such to the right of the continental craton, and the other on the left side.
		Divergent plate boundaries always create new ocean floor (that is, new mafic oceanic lithosphere, called the ophiolite suite) when magma oozes into the crack as plates separate.
	csmres.jmu.edu /geollab/Fichter/PlateTect/plates.html (1238 words)

	Pacific Plate - Encyclopedia, History, Geography and Biography
		To the north the easterly side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan de Fuca Ridge and the Gorda Ridge.
		In the middle the easterly side is a transform boundary with the North American Plate along the San Andreas Fault and a boundary with the Cocos Plate.
		The westerly side is a convergent boundary subducting under the Eurasian Plate to the north and the Philippine Plate in the middle forming the Mariana Trench.
	www.arikah.com /encyclopedia/Pacific_Plate (262 words)

	Divergent boundary - Wikipedia, the free encyclopedia
		In plate tectonics, a divergent boundary (divergent fault boundary or divergent plate boundary), (but also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.
		It is thought that convection currents in the Earth's mantle rise to the base of the lithosphere where the divergent plate boundary exists.
		Because of this, rock closest to the boundary is younger than rock further away on the same plate.
	en.wikipedia.org /wiki/Divergent_boundary (292 words)

	divergent1 (Site not responding. Last check: 2007-09-10)
		Where a divergent boundary crosses the land, the resulting rift valleys which form range from 30 to 50 kilometers wide.
		Divergent boundary examples include the East Africa rift in Kenya and Ethiopia, and the Rio Grande rift in New Mexico.
		Where a divergent boundary crosses the ocean floor, the resulting rift valley is much narrower, usually a kilometer or less across, and it runs along the top of a midoceanic ridge.
	www.pwcs.edu /i-tech/Resources/TLCF02/Volcanoes/processes_of_formation_divergent_boundaries_divergent1.html (244 words)

	Earth Floor: Plate Tectonics
		Places where plates are coming apart are called divergent boundaries.
		Where a divergent boundary crosses the land, the rift valleys which form are typically 30 to 50 kilometers wide.
		Where a divergent boundary crosses the ocean floor, the rift valley is much narrower, only a kilometer or less across, and it runs along the top of a midoceanic ridge.
	www.cotf.edu /ete/modules/msese/earthsysflr/plates3.html (259 words)

	PlanetPapers - Earthquakes
		Divergent boundaries mostly occur on the sea floor and therefore the earthquakes that happen at these boundaries are distributed along the boundary.
		This means that the distributions of earthquakes at divergent boundaries are at shallow depths, where the crust is been pulled apart.
		This means that the triggering of an earthquake at a divergent boundary triggers an earthquake at a convergent plate.
	www.planetpapers.com /Assets/1941.php (1654 words)

	Divergent Plate Boundaries - Divergent Boundary - Geology.com
		Divergent plate boundaries are locations where plates are moving away from one another.
		Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions; shallow earthquake activity; creation of new seafloor and a widening ocean basin.
		Effects that are found at this type of plate boundary include: a rift valley sometimes occupied by a long linear lakes or a shallow arm of the ocean, numerous normal faults bounding a central rift valley and shallow earthquake activity along the normal faults.
	geology.com /nsta/divergent-plate-boundaries.shtml (670 words)

	Plate boundaries
		Plate boundaries are found at the edge of the lithospheric plates and are of three types,
		Divergent boundaries are responsible in part for driving the motion of the plates.
		Another example of a transform boundary is seen at the mid-ocean ridges, where the spreading centers are offset by transform faults anywhere from a few meters to several kilometers in length.
	scign.jpl.nasa.gov /learn_unix/plate4.htm (940 words)

	Plate Tectonics : Plate Boundaries
		As the giant plates move, diverging [pulling apart] or converging [coming together] along their borders, tremendous energies are unleashed resulting in tremors that transform Earth’s surface.
		The San Andreas fault zone in California is a transform fault that connects the East Pacific Rise, a divergent boundary to the south, with the South Gorda -- Juan de Fuca -- Explorer Ridge, another divergent boundary to the north.
		Land on the west side of the fault zone (on the Pacific Plate) is moving in a northwesterly direction relative to the land on the east side of the fault zone (on the North American Plate).
	www.platetectonics.com /book/page_5.asp (831 words)

	Pacific Trenches (Site not responding. Last check: 2007-09-10)
		Divergent boundaries exist where plates move away from each other, pushed apart by heated, material moving upwards from the asthenosphere.
		An additional force involved in divergence may be the subduction of the heavier, older, and thicker crust at the opposite ends of each diverging plate.
		Ocean trenches at the boundary of the plate and mountain chains on the continental plate often result.
	www.pacificislandtravel.com /nature_gallery/pacifictrenches.htm (1190 words)

	Plate Tectonic Theory: Plates and Interplate Relationships
		It is possible a plate could be a continent alone, but for this to occur all edges of the continent would have to be a plate boundary (very rare, perhaps not practically possible).
		Divergent plate boundaries always create new ocean floor (that is, new oceanic lithosphere, called the ophiolite suite).
		Thus, any time there is a divergent plate boundary where two plates are separating, there must be a convergent plate boundary (subduction zone) where the earth comes together again.
	csmres.jmu.edu /geollab/vageol/vahist/plates.html (917 words)

	Understanding plate motions [This Dynamic Earth, USGS]
		Divergent boundaries -- where new crust is generated as the plates pull away from each other.
		Plate boundary zones -- broad belts in which boundaries are not well defined and the effects of plate interaction are unclear.
		Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle.
	pubs.usgs.gov /publications/text/understanding.html (2502 words)

	Plate Tectonics: Divergent Plate Boundaries
		Divergent boundaries begin by splitting apart segments of continental crust along rift valleys.
		Narrow oceans represent youthful divergent boundaries and wide oceans are indications of a long-lived ocean basin.
		Divergent plate boundary: Where plates move apart, e.g., separation of plates along oceanic ridges.
	www.mhhe.com /earthsci/geology/mcconnell/pte/dpb.htm (553 words)

	[No title] (Site not responding. Last check: 2007-09-10)
		A divergent boundary, or spreading center boundary, is a boundary at which plates are moving away from one another.
		In some divergent boundaries in continental areas, the magma composition is changed as it moves upward from the mantle and partially melts continental crust.
		As a result of the lower density crust and upward movement of the hot mantle rocks, the elevation of the land surface or sea floor in the area of divergence is generally higher than in areas distant from the divergent boundary.
	cse.cosm.sc.edu /hses/RthCrust/Features/pages/diverge.htm (901 words)

	Convergent boundary - Wikipedia, the free encyclopedia
		In plate tectonics, a convergent boundary – also known as a convergent plate boundary, active margin, compression boundary or a destructive boundary – is a region of the Earth's crust where two tectonic plates are in motion toward one another.
		A subduction zone forms at a convergent plate boundary when one or both of the tectonic plates is composed of oceanic crust.
		Occasionally plate convergent boundaries are involved with complex faulting and can form transform plate boundaries, where some component of strike-slip faulting is involved at a zig-zag section of the plate boundary.
	en.wikipedia.org /wiki/Convergent_boundary (408 words)

	Divergent Plate Boundary \| World of Earth Science
		In terms of plate tectonics, divergent boundaries are areas under tension where lithospheric plates are pushed apart by magma upwelling from the mantle.
		At divergent boundaries, lithospheric plates move apart and crust is created.
		Divergent movement of lithospheric plates can best be conceptualized by the movement apart of those peeled sections over a curved surface (e.g., over a ball).
	www.bookrags.com /research/divergent-plate-boundary-woes-01 (491 words)

	Quia - Plate Tectonics
		boundary between two plates that are moving apart
		boundary where two plates are moving toward each other
		boundary where two plates are moving past each other
	www.quia.com /jg/262313list.html (147 words)

	Tectonic Plates
		Three types of movement are recognized at the boundaries between plates: convergent, divergent and transform-fault.
		The San Andreas Fault zone is an example of this type of boundary where the Pacific Plate on which Los Angeles sits is moving slowly northwestward relative to the North American Plate on which San Francisco sits.
		Plate tectonics, the branch of science that deals with the process by which rigid plates are moved across hot molten material, has helped to explain much in global-scale geology including the formation of mountains, and the distribution of earthquakes and volcanoes.
	www.webspawner.com /users/thecosyslughutt/tectonicplates.html (2216 words)

	Divergent Plate Movement
		This divergent boundary is considered constructive since new crust is formed.
		Divergent takes place at the boundary of the oceanic plates and forms new sea floor.
		Volcanoes can also form undersea at these divergent boundaries, they are called submarine volcanoes and have gentle eruptions.
	library.advanced.org /17701/high/tectonics/ptdiv.html (112 words)

	A Science Odyssey: You Try It: Plate Tectonics: Slide (Site not responding. Last check: 2007-09-10)
		New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth's surface.
		The boundary where the two plates meet is called a convergent boundary.
		At a depth between 190 and 430 miles (300 and 700 kilometers), the rock of the descending plate melts.
	www.pbs.org /wgbh/aso/tryit/tectonics/convergent.html (133 words)

	Plate Tectonics, the Cause of Earthquakes (Site not responding. Last check: 2007-09-10)
		Plate boundaries in different localities are subject to different inter-plate stresses, producing these three types of earthquakes.
		At spreading ridges, or similar extensional boundaries, earthquakes are shallow, aligned strictly along the axis of spreading, and show an extensional mechanism.
		At compressional boundaries, earthquakes are found in several settings ranging from the very near surface to several hundred kilometers depth, since the coldness of the subducting plate permits brittle failure down to as much as 700 km.
	www.seismo.unr.edu /ftp/pub/louie/class/100/plate-tectonics.html (953 words)

	ch4_Divergent Plate boundaries
		Relatively short segments of transform boundaries along oceanic ridges are not identified.
		Divergent plate boundary - where plates move apart, e.g.
		Transform plate boundary - where plates slide past each other, neither is consumed or created.
	www.mhhe.com /earthsci/geology/mcconnell/plate_tectonics/dpb.htm (520 words)

	10.5
		TRANSFORM PLATE BOUNDARY: A plate boundary where the plates on either side are sliding past each other.
		DIVERGENT PLATE BOUNDARY: A plate boundary where the plates on either side are moving away from each other
		CONVERGENT PLATE BOUNDARY: A plate boundary where the plates on either side are moving towards each other.
	www.earthquakecountry.info /10.5/glossary (625 words)

	Lecture Outline Wednesday September 3, 2003 (Site not responding. Last check: 2007-09-10)
		Divergent Boundaries and the Origin of Ocean Basins
		As mantle material rise toward the divergent plate boundary the pressure is drastically reduced which causes melting (decompression melting).
		As new oceanic crust is formed (solidifies from molten rock) it locks in the current magnetic field, so the further away from the ridge the older the rock.
	www.wsu.edu /~geology101/WebMon_Aug_29.html (388 words)

	Earth Floor: Plate Tectonics
		The place where the two plates meet is called a plate boundary.
		Boundaries have different names depending on how the two plates are moving in relationship to each other
		With respect to plate boundaries is your home located in the middle of, or near the boundary of a plate?
	www.cotf.edu /ete/modules/msese/earthsysflr/plates1.html (198 words)

	USGS Geology in the Parks
		The plates can push against each other, producing a convergent plate boundary, the plates can move apart, forming a divergent plate boundary, or the plates can slip past each other side to side, which geologists call transform plate boundaries.
		Almost all the Earth's new crust forms at divergent boundaries, but most are not well known because they lie deep beneath the oceans.
		This type of boundary separates the North American plate from the Pacific plate along the San Andreas fault, a famous transform plate boundary that's responsible for many of California's earthquakes.
	wrgis.wr.usgs.gov /docs/usgsnps/pltec/pltec3.html (305 words)

	A transform boundary
		At this boundaries, two plates slip laterally in a strike-slip fault.
		Conservative boundary, there is a situation that neither creates new crust nor destroy old.
		The plates became separated and drifted in various directions, the divergence associated with seafloor spreading and the convergence involving collision, subduction and mountain building.
	www.geo.utep.edu /pub/ortega/lectures10scon.html (577 words)

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