RIFT VALLEY

elongated depression, trough, or graben in the earth's crust, bounded on both sides by normal faults and occurring on the continents or under the oceans. The central flat block forming the trough slips downward relative to the crustal blocks on either side. The appearance is that of a fallen keystone in a broken arch. Rift valleys form by tensional forces, typically those associated with the initiation of plate separation (see plate tectonics). The development of a rift valley in a continent is believed to be a precursor to the breakup of the continent and the development of a new ocean basin by seafloor spreading. Rift valleys, such as the Red Sea and the African rift valleys, are commonly the sites of volcanism and the locus of much earthquake activity.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Rift Valley
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books on: Rift Valley  - 1098 results

       More book Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Bridging the Rift: The New South Africa in Africa
Book by Larry A. Swatuk, David R. Black; Westview Press, 1997
Subjects: Africa--Economic Integration, Africa--Foreign Economic Relations--South Africa, South Africa--Foreign Economic Relations--Africa
...July/August 1995: 24-6 . While the Moi regime has insisted that the building of the airport will open up the Rift Valley Province to economic development, critics argue that another airport is not a priority and that, in any case, it...
2.
Valley Forge: Making and Remaking a National Symbol
Book by Lorett Treese; Pennsylvania State University Press, 1995
Subjects: Historic Sites--Conservation And Restoration--Pennsylvania--Valley Forge--History, Parks--Pennsylvania--Valley Forge--History, Valley Forge (Pa.)--History, Valley Forge National Historical Park (Pa.), Washington, George--1732-1799--Headquarters--Pennsylvania--Valley Forge
...was engaged in forming a new Valley Forge organization--the Valley Forge Historical Society. Burk...the museum and library. The Valley Forge Historical Society, however...Memorial Arch. Around 1917, a rift began to open between W. Herbert...
3.
Rift in the Democracy
Book by James C. N. Paul; University of Pennsylvania Press, 1951
Subjects: Democratic Party (U.S.)--History, Texas--Annexation to the United States, United States--Politics and government--1837-1841, United States--Politics and government--1841-1845
...40 or fight." 48 Thus sabers rattled in the Mississippi valley in the summer of 1843, where men were impatient to get on with...48 A Declaration of Citizens of Mississippi Valley Assembled at Cincinnati , July 5, 1843, in Allen Pprs.
4.
A Country Between: The Upper Ohio Valley and Its Peoples, 1724-1774
Book by Michael N. McConnell; University of Nebraska Press, 1992
Subjects: Ohio River Valley--History--To 1795
...Indians--natives from the middle Delaware Valley. By the mid-1760s these groups had largely...unchecked in the early 1760s, an open rift appeared between the two Delaware societies...consolidation drew 13. The Beaver River Valley, showing the location of Custalogas Town...
5.
The Conservation Fight: From Theodore Roosevelt to the Tennessee Valley Authority
Book by Judson King; Public Affairs Press, 1959
Subjects: Electric Utilities--United States, Natural Resources--United States, Tennessee Valley Authority
...Secretary of War in an embarrassing position. Although he did not favor federal control, President Roosevelt did. An open rift with his chief was not politic. Taft resolved the difficulty by handing the resolution to the Army Engineers. A forthright...
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journal articles on: Rift Valley  - 423 results

       More journal Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Direct Dating of Authigenic K-feldspar Overgrowths from the Kilombero Rift of Tanzania
Journal article by E. Hagen, S. P. Kelley, H. Dypvik, O. Nilsen, B. Kjolhamar; Journal of the Geological Society, Vol. 158, 2001
Subjects: Geological time, Sediments, Tanzania, Valleys
...illustrated in the Kilombero Rift Valley in Tanzania (Figs 1 2). Here...feldspar, are common cements in rift valley settings (Morad et al. 1989...sedimentological setting The present Kilombero Rift Valley constitutes two prominent synthetic...
2.
Rifting Archaean Lithosphere: the Eyasi-manyara-natron Rifts, East Africa
Journal article by C. Ebinger, Y. Poudjom Djomani, E. Mbede, A. Foster, J. B. Dawson; Journal of the Geological Society, Vol. 154, 1997
Subjects: Geology, Plate tectonics, Tanzania, Volcanoes
...the flanks to 90 km beneath the rift valley, where it is half its Early Tertiary...km beneath the Natron-Magadi rift valley (Birt et al. 1995). Estimates...dominated by the Neogene-Recent rift valley and its uplifted flanks, but a...
3.
Tectonic Development of the Northern Tanzanian Sector of the East African Rift System
Journal article by A. Foster, C. Ebinger, E. Mbede, D. Rex; Journal of the Geological Society, Vol. 154, 1997
Subjects: Geological time, Plate tectonics, Tanzania, Volcanoes
...along-axis segmentation of rift valleys and their flanks is common...influence the size and shape of rift basins and the spacing of volcanic...Eastern Branch of the East African Rift System shows a marked divergence...is composed of three distinct rifts separated by largely unfaulted...
4.
U-pb Geochronology of Late Neoproterozoic Augen Granites in the Moine Supergroup, Nw Scotland: Dating of Rift-related, Felsic Magmatism during Supercontinent Break-up?
Journal article by P. D. Kinny, R. A. Strachan, H. Kocks, C. R. L Friend; Journal of the Geological Society, Vol. 160, 2003
Subjects: Geological time, Lava, Scotland, Volcanoes
...nA, mass resolution 500OR (1% valley), and sensitivity for Pb isotopes...Granitic rocks form an important part of rift-related igneous suites in zones...al. 2001) and the East African Rift Valley (Davies McDonald 1987). We therefore...
5.
Numerical Age Control for the Miocene-pliocene Succession at Lothagam, a Hominoid-bearing Sequence in the Northern Kenya Rift
Journal article by Ian McDougall, Craig S. Feibel; Journal of the Geological Society, Vol. 156, 1999
Subjects: Geological time, Geology, Kenya, Plate tectonics
...from the basalt in the steep valley cutting through the Lothagam...history of this part of the Kenya Rift over about a 10 Ma interval...characteristic of the northern Kenya Rift from Oligocene times. Our K...for faunal evolution and rift valley development within the Lothagam...
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magazine articles on: Rift Valley  - 344 results

       More magazine Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Rift Valley Project Shows Few Signs of Concrete Development
Magazine article by Kirk Albrecht; The Middle East, July 1995
Subjects: Economic development--Finance, Israel--Economic policy, Jordan River--Economic aspects, Jordan--Economic policy
Rift Valley project shows few signs...discuss development of the Rift Valley project held in Amman in April...their way, the Jordan Rift Valley (JRV) will become a showcase...interaction with the Jordan Rift Valley, has no doubts: "I dont...as irrigation for the Jordan Valleys farmers; and hydroelectric...
2.
Rift Valley Shuffle
Magazine article by Don Boroughs; International Wildlife, January 1999
Subjects: Flamingos--Behavior, Kenya--Plants and animals
RIFT VALLEY SHUFFLE by Don Boroughs Lake-hopping flamingos in Kenya dance to the...from a drought low of one foot. Some flew to other lakes in Kenyas Rift Valley, north to Bogoria or south to Magadi. Others landed in neighboring Ethiopia...
3.
Chinese Boost Kenya Geothermal Ambitions: Geothermal Power Is Clean and Cheap, and Kenya Has Plenty of It in the Great Rift Valley. but New Investment in This Source Has Been Hard to Come By-Until Recently with the Entry of the Chinese
Magazine article by Neil Ford; African Business, October 2007
Subjects: Electric utilities--Contracts, Geothermal energy--Economic aspects, Geothermal energy--Usage, Great Wall Drilling Co.--Contracts, Petroleum industry--Contracts
...Clean and Cheap, and Kenya Has Plenty of It in the Great Rift Valley. but New Investment in This Source Has Been Hard to...great deal of geothermal potential elsewhere in the Great Rift Valley and it is estimated that Kenya could possess about 2...
4.
Raja Shehadeh's a Rift in Time
Magazine article by Delinda C. Hanley; The Washington Report on Middle East Affairs, Vol. 30, July 2011
Subjects: Books, Palestinians, Personal relationships
...House, read from his latest book, A Rift in Time: Travels with my Ottoman...blends his fascination with the Great Rift Valley with a recently found memoir by a...imagine the land as it existed." "A Rift in Time is a book that takes two journeys...
5.
Unforgiven: The Rift between a Beleaguered Prime Minister and a Grieving Novelist Mirrors the Division Confounding Israel. Can the Two Men Overcome the Differences That Separate Them? Can Israel Overcome Its Paralysis to Make the Hard Choice Necessary for Its Survival as a Jewish Democracy?
Magazine article by Jeffrey Goldberg; The Atlantic Monthly, Vol. 301, May 2008
Subjects: Grossman, David (Israeli writer)--Family, Grossman, David (Israeli writer)--Political activity, Israel--Political aspects, Novelists--Family, Novelists--Political activity, Olmert, Ehud--Powers and duties, Prime ministers--Powers and duties
Unforgiven: The Rift between a Beleaguered Prime Minister and...an artists colony situated across the Valley of Hinnom from Mount Zion. Grossman told...already up to 40,000 Israelis in Silicon Valley (and more than a half million across the...
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newspaper articles on: Rift Valley  - 345 results

       More newspaper Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Rift Valley Fever Listed as Threat; Mosquito-Borne Illness Deadly to People, Animals
Newspaper article; The Washington Times, June 24, 2004
Rift Valley Fever Listed as Threat; Mosquito-Borne...deadlier to humans and livestock. Known as Rift Valley fever, or RVF, the disorder was...University of Georgia in Athens, said "Rift Valley is more virulent than West Nile virus...
2.
Marathon Runners Thrive in Kenya's Rift Valley: Fila, Adidas, Nike Sponsor Athletes Who Say Training Yields Champions
Newspaper article by Richard Engel; The Washington Times, November 4, 1999
Subjects: Kenya
Marathon runners thrive in Kenyas Rift Valley: Fila, Adidas, Nike sponsor athletes...a marathon runner in Kenyas rural Rift Valley. In fact, three of his six...Italian sports outfitter Fila. In the Rift Valley, children dream of becoming...
3.
Hot Rocks: Africa's Rift Valley Is Geothermal Gold Mine
Newspaper article; Manila Bulletin, December 14, 2008
Subjects: Gold mines and mining, Gold mining, Rocks, Slopes (Landforms), Slopes (Physical geography)
Hot Rocks: Africas Rift Valley Is Geothermal Gold Mine. POZNAN (AFP...geothermal power in East Africas Great Rift Valley, the UN talks on climate change...The geothermal potential from the Rift Valley is "at least 7,000 megawatts...
4.
A Place of Beauty, Danger, Misery, Wonder: GEOGRAPHIC VISITS AFRICA'S RIFT VALLEY
Newspaper article by Judith Kreiner; The Washington Times, July 14, 1996
Subjects: Africa
...wonder: GEOGRAPHIC VISITS AFRICAS RIFT VALLEY by Judith Kreiner Imagine, if you...occur. One such tear produced the Rift Valley of Africa, a place of striking...National Park in Zaire. There the Rift Valley is a place of volcanoes, a...
5.
Top Officer on Sick Leave after Bullying Claims; Council in Turmoil as Mayor-CEO Rift Widens
Newspaper article; The Chronicle (Toowoomba, Australia), January 5, 2010
...Claims; Council in Turmoil as Mayor-CEO Rift Widens. Byline: Lacey Burley lacey.burley@ thechronicle.com.au LOCKYER Valley local government has been thrown into turmoil...attended almost every meeting of the Lockyer Valley Regional Council since the local government...
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encyclopedia articles on: Rift Valley  - 45 results

       More encyclopedia Results: 1-10 11-20 21-30 31-40 41-45 >>  
 
1.
Great Rift Valley
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
GREAT RIFT VALLEY geological fault system of SW Asia and...Lake Victoria does not lie in the Great Rift Valley but between its main and western branches. The Great Rift Valley ranges in elevation from c.1...
2.
Rift Valley
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
RIFT VALLEY elongated depression, trough...keystone in a broken arch. Rift valleys form by tensional forces...The development of a rift valley in a continent is believed...seafloor spreading . Rift valleys, such as the Red Sea and...
3.
Africa
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...responsible for the formation of the Great Rift Valley of E Africa, which is the continents...from the northern end of the Jordan Rift Valley in SW Asia to near the mouth...River; the eastern branch of the rift valley is occupied in sections by...
4.
Palestine , Region, Asia
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...northernmost extension of the Great Rift Valley in which lies the Jordan River...Dead Sea, and the Arabah, a dry valley S of the Dead Sea; a ridge rising...Esdraelon (Jezreel) and the connecting valley of Bet Shean (Beisan), the most...
5.
Biqa, Al
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...beka , or El Bika el beka , upland valley of Lebanon and Syria, 75 mi (121...Lebanon ranges; highest part of the Rift Valley complex. The village of Baalbek...rivers in the northern part of the valley. In the area N of Baalbek, located...
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