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Topic: African Rift Valley


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In the News (Tue 21 May 19)

  
  Great African Rift Valley, Mount Kenya, About Great African Rift Valley
The Great Rift Valley is a result of tectonic activty in the earth's crust and was created due to drifting and separation of the African and Arabian tectonic plates around 35 million years ago.
The Great Rift Valley is home to spectacular glaciers, volcanoes, depressions and lakes, offering some of the most breathtaking scenery on the earth.
Among must see attractions in the Great Rift Valley in Kenya include the Lake Naivasha, Lake Elementeita, Lake Baringo, all known for their scenic beauty as well as rich and diverse avifauna, including flamingoes.
www.travour.com /tour-to-kenya/tourist-attractions-in-kenya/great-african-rift-valley.html   (467 words)

  
  Great Rift Valley - Wikipedia, the free encyclopedia
The Great Rift Valley is the result of the rifting and separation of the African and Arabian tectonic plates that began around 35 million years ago in the north, and by the ongoing separation of East Africa from the rest of Africa along the East African Rift, which began about 15 million years ago.
To the south in Israel, it is known as the Hula Valley separating between the Galilee mountains and the Golan Heights.
In Kenya the valley is deepest to the north of Nairobi.
en.wikipedia.org /wiki/African_Rift_Valley   (782 words)

  
 Rift valley - Wikipedia, the free encyclopedia
Rift valleys are produced by tensional tectonic forces which occur at divergent plate boundaries.
Rift valleys typically appear as a downdropped graben between a pair of faults, or vertical Earth movements.
Rift valleys are often associated with and flanked by volcanoes.
en.wikipedia.org /wiki/Rift_valley   (186 words)

  
 rift valley - HighBeam Encyclopedia
RIFT VALLEY [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.
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.
www.encyclopedia.com /html/r1/riftvall.asp   (308 words)

  
 NationMaster - Encyclopedia: Great Rift Valley
The African plate, shown in pinkish-orange The African Plate is a tectonic plate covering the continent of Africa and extending westward to the Mid-Atlantic Ridge.
Lake Magadi Lake Magadi is the southermost lake in the Kenyan Rift Valley, lying north east of Lake Natron.
The Rift Valley has been a rich source of anthropological discovery, especially in an area known as Piedmont.
www.nationmaster.com /encyclopedia/Great-Rift-Valley   (2388 words)

  
 Rift Valley province, Kenya   (Site not responding. Last check: 2007-10-20)
Rift Valley is the largest and one of the most economically vibrant provinces in Kenya.
It is dominated by the Great Rift Valley which passes through it and gives the province its name.
The people of the Rift Valley are hard-working and were the economic conditions in the whole country to improve, they would benefit to a great extent.
www.serebella.com /encyclopedia/article-Rift_Valley_province,_Kenya.html   (563 words)

  
 African Rift Valley - Hutchinson encyclopedia article about African Rift Valley   (Site not responding. Last check: 2007-10-20)
Volcanic valley formed 10–20 million years ago owing to rifting (major subsidence through faulting) of part of the Earth's crust, and running about 8,000 km/5,000 mi from the Jordan Valley through the Red Sea to central Mozambique in southeast Africa.
For most of its length the Rift Valley has a width of some 60 km/35 mi and, in highland areas especially, is bounded by inward-facing escarpments with a height which often reaches 500–1,000 m/1,500–3,000 ft. It is marked by a series of lakes, including Lake Turkana, and volcanoes, such as Mount Kilimanjaro.
The rift system associated with the Rift Valley extends into northern Botswana, with geological faults controlling the location of the Okavango Delta.
encyclopedia.farlex.com /African+Rift+Valley   (257 words)

  
 Penn State News
San Francisco — The formation and evolution of the African Rift Valley are shaded in mystery, but geoscientists at Penn State are mapping the history of the Rift through space and time by analyzing the chemistry of ancient lava from Lake Turkana, northern Kenya.
The African Rift Valley runs in eastern Africa from the junction of the Red Sea and the Gulf of Aden southward to Malawi where it gradually disappears.
The African Rift Valley is a heavily seismic area and there have been volcanic eruptions in the past 50 years.
www.psu.edu /ur/2001/africanrift.html   (697 words)

  
 African Conservation Foundation - Malawi - Conservation Projects.
The northern two-thirds of the rift valley floor are almost entirely occupied by Lake Malawi, which is 568km in length and varies in width from 16km to 80km.
The southern third of the rift valley is traversed by the River Shire, draining Lake Malawi, via the shallow Lake Malombe, to the River Zambezi.
The plateau surfaces on either side of the rift valley lie mainly at 760-1,370m but very much higher elevations are attained; above the highlands west of Lake Malawi are the Nyika and Viphya plateaux and the Dedza mountains and Kirk Range, which rise to between 1,524 and 2,440m in places.
www.africanconservation.com /malawiprofile.html   (705 words)

  
 Rift Valley Fever: First Out of Africa
Noted as a disease in Kenya's Rift Valley as early as the turn of the last century (the causative virus was isolated in 1930), it has been seen at irregular intervals on the continent, particularly after heavy rains that favor mosquito breeding.
The problem, it appears, lies in the fact that early animal deaths from the disease usually go unnoticed and do not, even when the numbers grow, greatly impress upon agriculture officials their significance as a reportable disease until human cases are diagnosed.
Rift Valley Fever is part of the sand fly fever group(Phleborivus genus, Bunyaviridae family), but the only fever of this group vectored by mosquitoes.
www.fas.org /ahead/disease/rvf/outbreak/2000arabia.htm   (587 words)

  
 ScienceDaily: Researchers Investigate Mysteries Of The African Rift
San Francisco, Cal. -- The formation and evolution of the African Rift Valley are shaded in mystery, but geoscientists at Penn State are mapping the history of the Rift through space and time by analyzing the chemistry of ancient lava from Lake Turkana, northern Kenya.
The area is actively changing, but while Furman and Knight know that the rift north of Ethiopia is now an ocean ridge and that the rift south of Turkana is not, they still do not know when, where and how the change from mantle plume to mid ocean ridge occurs.
African Landscape Shaped By Single Magma Plume (November 1, 1998) -- The majestic slopes of Mount Kilimanjaro.
www.sciencedaily.com /releases/2001/12/011213084056.htm   (2008 words)

  
 Plate Tectonics
The East African rift marks the boundary between two tectonic plates: the Nubian plate to the west and the Somalian plate to the east.
A general rule of plate tectonics is that such rifts must hook up to other plate boundaries, but researchers have had trouble tracing the connection of the East African rift.
In the region of the East African rift, far north of the pivot point, the two plates are separating by 6 millimeters a year.
www.platetectonics.com /article.asp?a=50&c=3   (346 words)

  
 Rift Valley In East Africa - The Continent Of Africa   (Site not responding. Last check: 2007-10-20)
It has been created through the rifting and separation of the African and Arabian tectonic plates that began around 35 million years ago in the north, and by the ongoing separation of East Africa from the rest of Africa along the East African Rift, which began about 15 million years ago.
The northernmost part of the Rift forms the valley of the Jordan River, which flows southward through the Hula Lake and the Sea of Galilee in Israel to the Dead Sea.
Lake Victoria, the second largest freshwater lake in the world, is considered part of the Rift Valley system although it actually lies between the two branches.
www.hart-of-africa.com /rift.html   (672 words)

  
 American Zoo and Aquarium Association
In addition to the giraffe herd, two species of antelope, African ground birds, red river hogs, cattle egrets, vultures and a colony of meerkats are also a part of the ARV family.
The biggest attraction to open in Colorado Springs in many years, ARV is the signature exhibit at the Zoo's front door.
Zoo visitors hand-feed the giraffes at a variety of feeding stations and a twice daily giraffe stampede is a hit with guests as they line the exhibit's boardwalk to watch the giraffe herd pass through a drawbridge, allowing them to leave their holding building each morning and re-enter each evening.
www.aza.org /HonorsAwards/ExhibitCheyMtnZoo   (500 words)

  
 African Landscape Shaped By Single Magma Plume
They argue that the Snake River Valley in eastern Idaho is the path of the magma plume that now lies underneath Yellowstone and is the source of its geysers and hydrothermal wonders.
Lake Superior lies in a rift valley created by a giant magma plume that was active 1.1 billion years ago and sent lava all the way down to Mexico.
The African plume is currently centered near the southern border between Ethiopia and Sudan.
www.eurekalert.org /pub_releases/1998-10/SU-ALSB-281098.php   (665 words)

  
 Newswise   (Site not responding. Last check: 2007-10-20)
An embryonic rift valley in Botswana, the southwestern extension of the East African Rift System, where some of the earliest hominids have been discovered, may also hold answers to continental breakup, according to a geologist who is studying how the rift has formed.
Newswise — An embryonic rift valley in Botswana, the southwestern extension of the East African Rift System, where some of the earliest hominids have been discovered, may also hold answers to continental breakup, according to a University of Missouri-Rolla geologist who is studying how the rift has formed.
Such is the case at the East African Rift zone where the ground is splitting apart, revealing layers of sediment dating to more than 14 million years ago.
www.newswise.com /articles/view/506117   (440 words)

  
 Ethiopia, the Red Sea, and the Nile River
divergent rift valley, one of the few areas on Earth where a continent is being actively separated (rifted) by the ongoing forces of plate tectonics.
North of the Rift Valley, in central Ethiopia, are the Simien Mountains and Lake Tana.
The reduction of sediments in the Nile north of the river, due to trapping of the sediments in Lake Nasser behind the Aswan dam, is one reason that the Nile River delta is slowly sinking.
daac.gsfc.nasa.gov /oceancolor/scifocus/oceanColor/Ethiopia.shtml   (1146 words)

  
 The Great Rift Valley, African Safari, Kenya Beach Holidays, Tanzania Zanzibar Mombasa   (Site not responding. Last check: 2007-10-20)
This geologic phenomena, dubbed the Great Rift Valley by the Scottish explorer John Walter Gregory, divides Kenya neatly down the length of the country essentially separating east from west.
Today's Rift Valley is characterized by uninhabitable desert and fertile farmland, flat arid plains and steep escarpments.
Each of the lakes in the Rift Valley string have a slightly different water composition ranging from freshwater to extremely alkaline, highly saline to brackish.
www.africansafariair.com /riftvalleytour.html   (361 words)

  
 The Rift Lakes
Lake Malawi is the southern most and the third largest of the east African Rift valley Lakes, with a length north to south of around 595.5 km, and width varying from 16-80.5 km.
In addition to being one of the largest Rift Lakes, it is also one of the oldest freshwater lakes in the world having existed in one form or another for nearly a million years, a major contributing factor in its biodiversity.
It is also the second largest of the African lakes with a surface area of ~32, 000 sq km, the second deepest (~1,471 km at maximum depth), and has an incredible North to South extension (~670 km).
www.malawicichlidhomepage.com /aquainfo/rift_lakes.html   (1631 words)

  
 The East African Rift Valley
A bit further west is the East African Rift Valley, an arm of the best example in the today's world of a triple junction.
The formation of the Rift Valley, along with the Red Sea and the Gulf of Aden, is an example of the process of continental rifting.
Along the floor of the Rift Valley, I saw the evidence of hot rock still near the surface.
www.geocities.com /daleeasley/Essays/EastAfricanRift.html   (694 words)

  
 GEO_PLATE_T-35.HTML   (Site not responding. Last check: 2007-10-20)
It was nearly impossible to study the rift in its entirety until the advent of space-acquired imagery because of its size (Mohr, 1973, 1974).
In the area shown on this Plate mosaic, the rift appears to be independent of Precambrian structures (i.e., the trend of the rift and the strike of the Precambrian structure are divergent).
The complex structure of the Precambrian rocks that comprise the uplands is clearly visible on both sides of the rift near the center of the mosaic.
geoinfo.amu.edu.pl /wpk/geos/GEO_2/GEO_PLATE_T-35.HTML   (730 words)

  
 Ethiopia - Topography and Drainage
To the south, at approximately 9° north latitude, the Great Rift Valley becomes a deep trench slicing through the plateau from north to south, its width averaging fifty kilometers.
The southern half of the Ethiopian segment of the valley is dotted by a chain of relatively large lakes.
In contrast with the plateau's steep scarps along the Great Rift Valley and in the north, the western and southwestern slopes descend somewhat less abruptly and are broken more often by river exits.
www.countrystudies.us /ethiopia/40.htm   (892 words)

  
 Rift Valley Institute   (Site not responding. Last check: 2007-10-20)
The Rift Valley Institute is currently in the process of verifying the database against information collected by other agencies, specifically agencies that are assisting former abductees to return home from the north.
The Rift Valley Institute is continuing to develop the software - to improve useability and, in cooperation with organizations working in Government-controlled areas, incorporate new data fields for additional information about abductees located in the North.
He is a research associate of the School of Oriental and African Studies at London University and Chair of the Rift Valley Institute.
www.riftvalley.net /inside/projects.htm   (2007 words)

  
 Kenya Geology Photographs   (Site not responding. Last check: 2007-10-20)
Rifts form where the forces of plate tectonic cause large blocks of the upper mantle and earth crust to move apart, allowing magma to rise from the upper mantle.
Lake Bogoria is one of a chain of lakes situated in the East African Rift.
Ground waters are heated by rising magmas and hot rocks, and the lighter hot water and steam rises to the surface by the force gravity.
www.umr.edu /%7Erhagni/Kenya.html   (476 words)

  
 Magic Safaris - Animals - The Great Rift Valley
The Great Rift Valley created by a fissure in the earth's crust, extends for approximately 8 700 kilometres stretching from Syria in the north to Mozambique in the south.
The Great African Rift Valley is such a prominent feature on the surface of the Earth that it can be seen from as far away as the moon.
The Great African Rift Valley is a unique ecosystem and is actually divided into two forks, the eastern rift and the western rift.
www.magic-safaris.com /animals/detail.php?id=3   (295 words)

  
 African Rift Valley Exhibit Page
For those with an adventurous streak, the African Rift Valley offers the opportunity to walk along a safari discovery trail that is immersed inside the ARV animal yard.
African Rift Valley’s innovative design is by Gary Lee of CLR Design of Philadelphia.
The African Rift Valley exhibit is the first project undertaken in the Zoo’s $50 million Master Plan.
www.cmzoo.org /africanriftvalley.html   (1453 words)

  
 African Cichlids
Another of the African Rift Valley lakes, Lake Tanganyika is home to over 175 species of cichlid, ranging from the largest species, Boulengerochromis microlepis, which grows to a maximum length of 90 cm, to the smallest species, which there are many, which often grow not larger than 3.5 cm.
The substrate is often sand and rock, as many of these cichlids are substrate spawners, in which the substrate is used as a medium for the eggs prior to hatching.
There are more open water swimming fish in Tanganyika than most of the African Rift Valley lakes, therefore these fish often require larger aquaria that are sparsely decorated.
www.versaquatics.com /africancichlids.htm   (506 words)

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