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Translation memories are created by human, but computer aligned, which might cause mistakes. Lake Victoria, the largest freshwater lake in Africa, is not a rift lake, for instance. Rift valleys are typically deep and narrow. See the full definition for rift valley in the English Language Learners Dictionary, Thesaurus: All synonyms and antonyms for rift valley, Britannica.com: Encyclopedia article about rift valley. 4 Further evidence contradicting the traditional symmetric rift valley model comes from observations of their morphology and surface structure. failed or stunted arm of a triple junction in a plate tectonics rift system. What does rift-valley mean? The Gregory Rift stretches from the Red Sea and the Arabian Sea to as far south as Mount Kilimanjaro. American Association of Petroleum Geologists: Dead Sea Geology Promise Unmet, National Geographic Science: Valleys—Natural Depressions, National Geographic Science: Plate Tectonics. rift valleys synonyms, rift valleys pronunciation, rift valleys translation, English dictionary definition of rift valleys. area where two or more tectonic plates are moving away from each other. Also called a conservative plate boundary. It did not sink as a result of the nearby East African Rift. All of the rift valleys in the “system” are connected, but not part of a single unit. Rift Valley fever (RVF) is a viral zoonosis that primarily affects animals but can also infect humans. region of southwest Asia and northeast Africa. In the original definition by John W. Gregory (1894) a rift valley is "a linear valley with parallel and almost vertical sides, which has fallen owing to … Be warned. Medical Eponyms © Farlex 2012 Want to thank TFD for its existence? Any interactives on this page can only be played while you are visiting our website. rift valley n noun: Refers to person, place, thing, quality, etc. The Rights Holder for media is the person or group credited. An example of physical weathering is wind blowing across the desert playas. If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Washington, DC 20036, National Geographic Society is a 501 (c)(3) organization. having to do with the physical formations of the Earth. That’s about 20% of the diameter of Mars itself! Accessed 17 Mar. A daily challenge for crossword fanatics. Privacy Notice | depression in the earth caused by a river eroding the surrounding soil. Scientists think that the tectonic activity that created the East African Rift also contributed to creating an environment that was ideal to the proliferation of life. This action is manifest as crustal extension, a spreading apart of the surface, which is subsequently further deepened by the forces of erosion. solid material transported and deposited by water, ice, and wind. One of the most important features of the Gregory Rift is the Afar Triple Junction, found where the Horn of Africa straddles the Red Sea and the Gulf of Aden in the Arabian Sea. 3 The Rift Valley, the scene of the clashes involving Moi's minority Kalenjin people, was described a war zone. a crack in the Earth's crust where there has been movement. Estudios Geológicos, 30: 219–227 Aguirre, E. Farther north the western depression, known as the Great Rift Valley is occupied for more than half its length by water, forming the Great Lakes of Tanganyika, Kivu, Lake Edward and Lake Albert, the first-named over 400 miles (600 km) long and the longest freshwater lake in the world. Terms of Service | Aunque generalmente se habla de este valle para referirse solo a su parte africana, desde Yibuti a Mozambique, lo cierto es que el mar Rojo y el valle del Jordán también forman parte de él. rift valley - WordReference English dictionary, questions, discussion and forums. Valles Marineris was formed millions of years ago, when the rocky Martian lithosphere was still rifting and shifting. (noun) Today, the theory of continental drift has been replaced by the science of plate tectonics. The Great Rift Valley is a series of contiguous geographic trenches, approximately 7,000 kilometres (4,300 mi) in total length, that runs from the Beqaa Valley in Lebanon which is in Asia to Mozambique in Southeast Africa. Today, these theories serve as the foundation upon which we understand the geologic processes that shape the Earth. El Gran Valle del Rift es una gran fractura geológica cuya extensión total es de 4830 kilómetros en dirección norte-sur. The San Andreas is a, Many of Earth’s deepest rift valleys are found underwater, dividing long mountain ranges called. Delivered to your inbox! Finds in the RiftMany, many important paleoanthropological discoveries have been made in the East African Rift, nicknamed the “cradle of humanity.” “Lucy,” for instance, is a 3.2 million-year-old hominin skeleton that was discovered in Ethiopia, while “Turkana Boy” is a 1.5-million-year old hominin skeleton unearthed in Kenya. Earth Science, Geology, Geography, Physical Geography, Photograph by Emory Kristof, National Geographic. series of faults and other sites of tectonic activity stretching from southwestern Asia to the Horn of Africa. 1145 17th Street NW one of the seven main land masses on Earth. the sudden shaking of Earth's crust caused by the release of energy along fault lines or from volcanic activity. A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. The program would convert the heat created by the rift valley’s underground activity into electricity through a series of steam wells. Text on this page is printable and can be used according to our Terms of Service. In 1977, after decades of tediously collecting and mapping ocean sonar data, scientists began to see a fairly accurate picture of the seafloor emerge. “Rift valley.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rift%20valley. Very few active rift valleys are found on continental lithosphere. The Earth’s crust is broken up into a series of massive sections called plates. Sustainability Policy | The movements of these plates can account for noticeable geologic events such as earthquakes, volcanic eruptions, and more subtle yet sublime events, like the building of mountains. Caused mostly by the burning of fossil fuels, acid rain is a form of precipitation with high levels of sulfuric acid, which can cause erosion in the materials in which it comes in contact. Such a fault is a fracture in the terrestrial surface in which the rock material on the upper side of the fault plane has been displaced downward relative to … Also called an extensional boundary. and and ) ©Jeffrey Mariner. system of lakes in and around the Great Rift Valley: Lake Albert, Lake Edward, Lake Kivu, Lake Malawi, Lake Tanganyika, Lake Turkana, and Lake Victoria. natural or artificial line separating two pieces of land. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. A rift valley’s walls may stand at heights of hundred feets, and they drop away in the form of terraces and steps. A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. Sea level is determined by measurements taken over a 19-year cycle. An example of chemical weathering is acid rain. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Rift Valley virus - a virus of the genus Phlebovirus that occurs in central and southern Africa in sheep, goats, and cattle; humans may become infected with close contact with infected animals. Teach your students about plate tectonics using these classroom resources. The Rift Valley of eastern Africa and Asia (sometimes called the Great Rift Valley [GRV] or East African Rift system [EAR or EARS]) is an enormous geological split in the crust of the earth, thousands of kilometers long, up to 125 miles (200 kilometers) wide, and between a few hundred to thousands of meters deep. These tectonic plates rest upon the convecting mantle, which causes them to move. A continent is one of Earth’s seven main divisions of land. rift in underwater mountain range where new oceanic crust is formed. Geologists discovered that new seafloor is formed where the tectonic plates at the mid-ocean ridges spread apart from each other—hence the, This process is accompanied by surface manifestations along the, The East African Rift is one of the world’s largest, Post the Definition of rift valley to Facebook, Share the Definition of rift valley on Twitter, A Player's Guide to 'Q' without 'U' Words. They come from many sources and are not checked. rift valley - a valley with steep sides; formed by a rift in the earth's crust vale, valley - a long depression in the surface of the land that usually contains a river Based on WordNet 3.0, Farlex clipart collection. rift valley definition: 1. a valley with steep sides formed by movements of the earth's surface 2. a valley with steep…. boundary between two tectonic plates, where the plates are moving horizontally or vertically in opposite directions, not against or away from each other. The continents are, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe, and Australia. small flow of water flowing naturally from an underground water source heated by hot or molten rock. If a media asset is downloadable, a download button appears in the corner of the media viewer. These resources can be used to teach middle schoolers more about the natural world, its distinctive features, and landscapes. South of the Red Sea Rift lies the massive, The two major rift valley systems of the East African Rift are the Gregory Rift and the Western Rift. ‘The most important discussion of volcanic activity focuses on the Owens Valley, which is in fact an active rift valley.’ These rift valleys are dotted by volcanoes: Erta Ale, Ethiopia; Mount Kenya, Kenya (an.