seafloor spreading definition
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- Seafloor spreading. Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.eafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
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Seafloor Spreading Key points. 1  Seafloor spreading takes place at midocean ridges and produces basalt, the rock that makes up the oceanic crust. 2  The Mid-Atlantic Ridge and East Pacific Rise are examples of midocean ridges. 3  Midocean ridges reach a typical summit elevation of 2,700 meters below sealevel.
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seafloor spreading unmoving oceans. Seafloor spreading proves that the ocean itself is a site of tectonic activity. Keeping Earth in Shape Seafloor spreading is just one part of plate tectonics. Subduction is another. Subduction happens where tectonic plates crash into each other instead of spreading apart.
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Subduction at Trenches The answer is that the ocean floor generally does not just keep spreading. Instead, the ocean floor plunges into deep under-water canyons called deep-ocean trenches. At a deep-ocean trench, the oceanic crust bends downward.
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Seafloor spreading Mid-ocean ridge - Description. 1  Mid-ocean ridges are geologically active, with new magma constantly emerging onto the ocean floor and into the crust at and near rifts along the ridge axes. 2  The rocks making up the crust below the seafloor are youngest along the axis of the ridge and age with increasing distance from that axis. New magma of basalt composition emerges at and near the axis because of decompression melting in the underlying Earth's mantle.
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What is Sea floor Spreading? Sea-floor spreading occurs where oceanic plates are diverging from one another. Plates are huge slabs into which the crust as well as the upper part of the mantle (the intermediate zones between the Earth’s crust and core) is divided.As the plates move apart, the rocks break and form a crack between the plates.mage Credit: Main Image: Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart. Plates are huge slabs into which the crust as well as the upper part of the mantle (the intermediate zones between the Earth’s crust and core) is divided.
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Translations for seafloor spreading Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
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- Definition of SEAFLOOR SPREADING. : the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates.ADVERTISEMENT.efinition of SEAFLOOR SPREADING. : the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates. ADVERTISEMENT.
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Where was the peace conference held after World War 1 ended? Answers.com ® WikiAnswers ® Categories History, Politics & Society History War and Military History World War 1 Where was the peace conference held after World War 1 ended?
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Seafloor Spreading 1 Seafloor spreading takes place at midocean ridges and produces basalt, the rock that makes up the oceanic crust. 2  The Mid-Atlantic Ridge and East Pacific Rise are examples of midocean ridges. 3  Midocean ridges reach a typical summit elevation of 2,700 meters below sealevel.
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Sea Floor Spreading and Polar Reversal So, some of the stripes of ocean floor would have normal polarity, meaning that the minerals in those rocks produced a magnetic field aligned in the same direction as the earth's present-day magnetic field.ea floor spreading is the process by which new oceanic crust is formed by the upwelling of magma through diverging tectonic plates. Learn about the relationship between sea floor spreading and polar reversals detected on the ocean floor.
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Chapter 5 Plate Tectonics Section 4 sea-floor Spreading As the molten material cools, it forms a strip of solid rock in the center of the ridge. Then more molten material splits apart the strip of solid rock that formed before, pushing it aside. This process, called sea-floor spreading, continually adds new material to the ocean floor. Scientists have found strange rocks shaped like pillows in the central valley of mid-ocean ridges. Such rocks can form only if molten material hardens quickly after erupting under water.
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Seafloor spreading The idea that the seafloor itself moves (and carries the continents with it) as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s.t the Mid-Atlantic Ridge (and in other areas), material from the upper mantle rises through the faults between oceanic plates to form new crust as the plates move away from each other, a phenomenon first observed as continental drift.
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Seafloor spreading occurs at what type of boundary? Seafloor spreading occurs at a diversion boundary. At this point,  tectonic plates pull away from each other and the gaps fills with  magma from the mantle.   Divergent boundaries. Crust is destroyed at the convergent plate boundary. This is  usually between the oceanic and continental plates.
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Seafloor Spreading paragraph.? (3) No, Hess *used* echo-sounding (sonar) to enormous effect, but he didn't invent it. (4) No, as seafloor spreads, hot magma (fluid rock) rises to fill the cracks. The rising magma can also be the cause of seafloor spreading, as it rises where there *isn't* a crack, and rises like a wedge, pushing the plates apart.
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seafloor spreading Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading. As it moves, it becomes cooler, more dense, and more thick. Eventually, older oceanic crust encounters a tectonic boundary with continental crust. In some cases, oceanic crust encounters an active plate margin.
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What is Sea floor Spreading? Image Credit: Main Image: Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart. Plates are huge slabs into which the crust as well as the upper part of the mantle (the intermediate zones between the Earth’s crust and core) is divided.agma is a very hot, molten rock which is formed within the earth by partial melting of the mantle. As a result, the age of the rocks increases as one move away from the rift-zone (place where the earth’s crust is pulled apart). The mid-oceanic ridge is the primary site for sea-floor spreading.
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Slip, Slide, & Collide Seafloor Spreading. Divergent boundaries in the middle of the ocean contribute to seafloor spreading. As plates made of oceanic crust pull apart, a crack in the ocean floor appears. Magma then oozes up from the mantle to fill in the space between the plates, forming a raised ridge called a mid-ocean ridge.
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seafloor spreading actual site of seafloor spreading. The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. Geographic Features Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading. As it moves, it becomes cooler, denser, and thicker. Eventually, older
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seafloor spreading Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.eafloor spreading Theory that explains how continental drift occurs. It proposes that the ocean floor is moved laterally as new basalt rock is injected along mid-ocean ridges, and so the ocean floor becomes older with increasing distance from the ridge. See also plate tectonics.
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chapter 17 environmental earth seafloor spreading. theory that states that new ocean crust is formed at ocean ridges and destroyed at deep sea trenches. how do ocean ridges and deep sea trenches support the theory of seafloor spreading. when magma hardens, a small amount of new ocean floor is added to earth. explain how ocean-floor rocks and sediments are evidence of seafloor spreading. the rocks and sediments were moved all over the sea floor.
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A&P Chapter 7 Sam is an accountant who is especially busy during tax season. Incorrect posture when sitting at a desk can result in kyphosis. Sam needs to practice good posture and/or invest in an ergonomic chair to help him maintain the proper thoracic vertebral curve.
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Welfare state More money was spent on welfare because more money circulated in the economy and because government revenues increased. In 1980, the OECD averaged social expenditures equal to 16 percent of GDP. In 2007, just before the financial crisis kicked into full gear, they had risen to 19 percent – a manageable increase.
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Seafloor spreading The rocks making up the crust below the seafloor are youngest along the axis of the ridge and age with increasing distance from that axis. New magma of basalt composition emerges at and near the axis because of decompression melting in the underlying Earth's mantle.
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seafloor spreading Seafloor spreading is just one part of plate tectonics. Subduction is another. Subduction happens where tectonic plates crash into each other instead of spreading apart. At subduction zones, the edge of the denser plate subducts, or slides, beneath the less-dense one.
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Translations for seafloor spreading Wiktionary (0.00 / 0 votes) Rate this definition: seafloor spreading (Noun). The outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift.eafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.