why is there volcanic activity in rift valleys
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- Volcanic activity in rift valleys is important in several different ways to both geology and. archaeology. First, the rocks, such as rhyolite and basalt, and also ashes are important for. correlation and dating the deposits and archaeological sites in rift valleys.olcanic activity in rift valleys is important in several different ways to both geology and. archaeology. First, the rocks, such as rhyolite and basalt, and also ashes are important for. correlation and dating the deposits and archaeological sites in rift valleys.
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How was the Great Rift Valley formed? How was the Great Rift Valley formed? It is formed by an upwelling of hot mantle material under the  valley (which has elevated the land) and then split it as the hot  mantle moves sideways away form the center …of upwelling. This  results in volcanoes and a Graben fault system (a rift valley)  above the upwelling.
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- Volcanic activity frequently occurs at the boundaries of the Earth's tectonic plates which are a series of large blocks moving between each other. The movement of these plates plays a significant role in the type of volcano formed, which influences its shape.
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Volcanism Volcanism (or vulcan activity) is the eruption of magma onto the surface of the Earth. Magma under the crust is under very great pressure. When folding and faulting occur, cracks or fractures appear. These are lines of weakness.
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Rift Zones The mid-ocean ridge is an example of a quiet rift volcano. Over much of the mid-ocean ridge magma is upwelled at nearly the same rate as the plates are spreading. Spreading along the mid ocean ridge occurs at a rate of anywhere from one centimeter to 20 centimeters per year (Bonatti and Crane 1984).he continued pressure will eventually create a rift zone, and a new ocean basin is born. These rift zones are characterized by volcanism and are inundated with transverse faults. The record of magnetic anomalies on the Atlantic Ocean floor record the direction of propagation of the rifts.
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Procedure, Levels and Results of Cardiolipin Antibodies Test Cardiolipin is a substance which is found in the human body when the person is suffering from diseases like syphilis, livedoid vasculitis, systemic lupus erythematosus, antiphospholipid syndrome, and spontaneous abortions.Cardiolipin antibodies are a form of antibodies directed against the mitochondria.evels of Cardiolipin. If the levels of cardiolipin antibodies are moderate or high in a test conducted after six weeks, and thereafter if the antibodies continue to persist, it is an indication of a persistent ailment.
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Fault block Fault-block mountains often result from rifting, another indicator of tensional tectonic forces. These can be small or form extensive rift valley systems, such as the East African Rift zone. Death Valley in California is a smaller example. There are two types of block mountains; lifted and sloped.ault-block mountains often result from rifting, another indicator of tensional tectonic forces. These can be small or form extensive rift valley systems, such as the East African Rift zone. Death Valley in California is a smaller example. There are two types of block mountains; lifted and sloped.
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- Plate rifting allows mafic magma to rise through the crust C Plate subduction from SCIENCE 114 at Simon Fraser
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- Confidence votes 48. A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time. mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together.
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- Magma (liquid rock) seeps upward to fill the cracks. In this way, new crust is formed along the boundary. Earthquakes occur along the faults, and volcanoes form where the magma reaches the surface. Where a divergent boundary crosses the land, the rift valleys which form are typically 30 to 50 kilometers wide.Examples include th e East Africa rift in Kenya and Ethiopia, and the Rio Grande rift in New Mexico.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.agma (liquid rock) seeps upward to fill the cracks. In this way, new crust is formed along the boundary. Earthquakes occur along the faults, and volcanoes form where the magma reaches the surface. Where a divergent boundary crosses the land, the rift valleys which form are typically 30 to 50 kilometers wide.
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- What occurs at a rift valley? A rift valley is an area where two tectonic plates are moving apart from each other. The greatest example of this is the African Rift Valley.
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Great Rift Valley, Kenya Some of the soils are Andisols, fertile soils from relatively recent volcanic activity. Lake Turkana occupies the northern end of the Great Rift Valley in Kenya. There are also volcanoes in Lake Turkana. The Suguta Valley, or Suguta Mud Flats, is an arid part of the Great Rift Valley directly south of Lake Turkana.
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- Volcanic activity. Where tectonic plates meet, the Earth’s crust becomes unstable as the plates slide past each other, push against each other, or ride under or over one another. Earthquakes and volcanic eruptions happen at the boundaries between plates. Magma (molten rock) is less dense than the crust. It can rise to the surface through weaknesses in the crust, forming a volcano. Geologists study volcanoes to try to predict future eruptions. Volcanoes can be very destructive, but some people choose to live near them because volcanic soil is very fertile. Earthquakes
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How Volcanoes Work 1 As the magma flows out, it cools, hardening to form new crust. This fills in the gap created by the plates diverging. This sort of magma production is called spreading center volcanism.  At the point where two plates collide, one plate may be pushed under the other plate, so that it sinks into the mantle.
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Chapter 6: Volcanoes & Other Igneous Activity Volcano that erupts mafic lava from linear pipes/vents and deposits sheet basalts. Fissures are usually found in or along rifts and rift zones, such as Iceland and the East African Rift. Fissure vents are often part of the structure of shield volcanoes.
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Physical Geography of sub-Saharan Africa The East African Rift Valley System is an example of a fissure in the Earth’s crust in which the continent is splitting apart, causing an extensive series of valleys, fingerlike freshwater lakes and volcanoes to form. The map below shows how dominant savanna zones are in sub-Saharan Africa, in particular the Sahel.he East African Rift Valley System is an example of a fissure in the Earth’s crust in which the continent is splitting apart, causing an extensive series of valleys, fingerlike freshwater lakes and volcanoes to form. The map below shows how dominant savanna zones are in sub-Saharan Africa, in particular the Sahel.
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- A rift valley is a lowland region formed by the interaction of Earth's tectonic plates. This small rift valley has a typical formation—long, narrow, and deep. It was formed by the Thingvellir rift, where the North American and Eurasian tectonic plates are tearing, or rifting, apart over a hotspot on the island of Iceland.
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- Quick Answer. Volcanic eruptions occur when magma builds up beneath the Earth's crust and forces its way to the surface. Natural vents in the crust allow magma passage to the surface, and eruptions occur when the magma that forms is less dense than the material above it, causing it to flow upward.
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- Sometimes magma forces its way through cracks in the crust, but fails to reach the surface. There the magma cools and hardens into rock.Volcanic eruptions create landforms made of lava, ash, and other materials.These landforms include shield volcanoes, cinder cone volcanoes, composite volcanoes, and lave plateaus.ometimes magma forces its way through cracks in the crust, but fails to reach the surface. There the magma cools and hardens into rock.
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The Ring of Fire is a string of underwater volcanoes and earthquake sites around the edges of the Pacific Ocean. The Ring of Fire is the result of plate tectonics. Much of the volcanic activity occurs along subduction zones which are convergent plate boundaries where two tectonic plates come together. The heavier plate is shoved (or subducted) under the other plate. When this happens, melting of the plates produces magma. The magma rises up through the overlying plate, erupting to the surface as a volcano. Subduction zones are also where Earth’s deepest ocean trenches are located and where deep earthquakes happen.
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East African Rift The East African Rift Zone includes a number of active as well as dormant volcanoes, among them: Mount Kilimanjaro, Mount Kenya, Mount Longonot, Menengai Crater, Mount Karisimbi, Mount Nyiragongo, Mount Meru and Mount Elgon, as well as the Crater Highlands in Tanzania.
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- Rift Valleys. Rift valleys are not caused by erosion but are created by tectonic activity. Grabens are another name for these valleys. Today geologists use the term graben primarily to describe valleys on the continents. The valleys form when continental crust is pulling apart allowing the land to drop down between parallel faults.
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Volcanoes related to plateboundaries Volcanoes occur along both subduction and rift zones but are generally absent along strike-slip plate margins. Most subduction-related volcanoes are explosive and build stratovolcanoes, while rift volcanoes tend to be more effusive and build shield volcanoes, though there are exceptions to both these generalities.
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High School Earth Science/Volcanic Landforms and Geothermal Activity Volcanoes are associated with many types of landforms. The landforms vary with the composition of the magma that created them. Hot springs and geysers are also examples of surface features related to volcanic activity.hen the lava solidifies, it creates a large, flat surface of igneous rock. Layer upon layer of basalt have created the Columbia Plateau, which covers more than 161,000 square kilometers (63,000 square miles) in Washington, Oregon, and Idaho.
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Plate Tectonics, Earthquakes, and Volcanoes When the stress finally reaches the breaking point, the energy is released in an earthquake. Therefore, most earthquakes are likely to occur along convergent, divergent, and transform tectonic plate boundaries. Where and Why do Volcanoes Occur? Volcanoes result when magma rises to the Earth's surface. One process that results in magma being formed, is the melting of tectonic plates being subducted. Therefore, most volcanoes are likely to occur along convergent or divergent tectonic plate boundaries. Diagram of the Pacific Rim of Fire. The Rim of Fire is a plate boundary and an area of intense volcanic and earthquake activity.
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Subduction Zone Volcanism As the gasses collect in the magma chamber, the pressure rises. It is possible for the pressure to rise so much that the chamber cannot contain the magma and it erupts explosively. Some US Parks that have active volcanoes formed as the result of subduction related processes are: 1  Crater Lake National Park, OR.