तधंगु रिफ्ट स्वनिग: Difference between revisions

'''तधंगु रिफ्ट स्वनिग''' छगु तधंगु भौगोलिक बनावट खः। थुकिगु हाक करिब ६००० कि मि दु। थ्व दक्षिण पश्चिम एसियायागु उत्तरी [[सीरिया]] निसें पूर्वी अफ्रिकायागु मध्य मोजाम्बिक तक्क थ्यं। थ्व स्वनिगयागु ब्या ३० निसें १०० किमि तक्क दु व थुकिगु जा छुं सछि निसें द्वलंद्व मिटर तक्क दु। थुकिगु नां अनवेषक [[जोह्न वाल्टर ग्रेगोरी]]नं तयादिगु खः।

 

पूर्वी अफ्रिकाय् थ्व स्वनिग निगु भागय् बाई, '''पूर्वी रिफ्ट''' व '''पश्चिमी रिफ्ट'''।

 

 

 

[[Image:EAfrica.jpg|thumb|right|300px|Map of East Africa showing some of the historically active volcanoes (red triangles) and the [[Afar Triangle]] (shaded, center) — a [[triple junction]] where three plates are pulling away from one another: the Arabian Plate, and the two parts of the African Plate (the Nubian and the Somalian) splitting along the East African Rift Zone (USGS).]]

 

The formation of the Rift Valley continues, probably driven by [[mantle plume]]s and ultimately a result of the [[African superswell]]. The associated geothermal activity and spreading at the rift has caused the [[lithosphere]] to thin from a typical 100 km thickness for continents to a mere 20 km. Though it is common for one arm of a triple junction to fail, if spreading continues the lithosphere may rupture several million years hence, splitting eastern Africa off to form a new landmass. In short, this will lead to the formation of a new [[mid-ocean ridge]].

The volcanic activity at this site and unusual concentration of [[hotspot (geology)|hotspot]]s has produced the volcanic mountains [[Mount Kilimanjaro]], [[Mount Kenya]], [[Mount Karisimbi]], [[Mount Nyiragongo]], [[Mount Meru, Tanzania|Mount Meru]] and [[Mount Elgon]] as well as the [[Crater Highlands]] in [[Tanzania]]. The [[Ol Doinyo Lengai]] [[volcano]] remains active, and is currently the only [[carbonatite|natrocarbonatite]] volcano in the world.

 

The Rift Valley has been a rich source of fossils that allow study of [[human evolution]], especially in an area known as Piedmont. Because the rapidly eroding highlands have filled the valley with sediments, a favourable environment for the preservation of remains has been created. The bones of several [[Hominidae|hominid]] ancestors of modern humans have been found there, including those of "[[Australopithecus afarensis|Lucy]]", a nearly complete [[australopithecine]] skeleton, which was discovered by anthropologist [[Donald Johanson]]. [[Richard Leakey|Richard]] and [[Mary Leakey]] have also done significant work in this region.

 

 

 

 

[[an:Bal d'o Gran Rift]]