what is the relationship between age of oceanic crust and distance from divergent plate boundary?
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The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. The magnetism of mid-ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century.
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Plate tectonics and the Hawaiian "Hot Spot" According to the plate-tectonics theory, the Earth's surface consists of about a dozen rigid slabs or plates, each averaging at least 50 miles thick. These plates move relative to one another at average speeds of a few inches per year--about as fast as human fingernails grow.
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No, ocean trenches do not occur at divergent plate boundaries. They are formed at convergent boundaries. Convergent boundaries are formed when...
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The divergent boundaries are the areas where plates are moving apart from one another. Where plates move apart, new crustal material is formed from molten magma from below the Earth's surface. Because of this, the youngest sea floor can be found along divergent boundaries, such as the Mid-Atlantic Ocean Ridge.
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The oceanic plate pushes into the land, and coastal mountains go up. That's a standard convergent plate boundary. It doesn't explain why the highest parts of the Rocky Mountains are more than 1000 km away from the plate boundary.
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The three main types are convergent, divergent and conservative. Divergent plate boundaries are where new crust is created. Mid ocean ridges are the main type. Convergent plate boundaries are where two plates collide.
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They also showed that layers of sediment were thinner at the crest and thickened farther out from that area. This showed that new oceanic crust was being formed along the plate boundary and then spreading out laterally, providing evidence to support the theory of seafloor spreading and plate tectonics.
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Transform boundaries: where crust is neither produced nor destroyed as the plates slide horizontally past each other.
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What are the characteristics of oceanic crust? Oceanic crust is thinner and more dense than continental crust. This is because it has been compressed by the weight of the oceans it carries above it. It is also much younger than Continental crust, as it is usually less than 200 million years old.
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The oldest crust in the ocean dates back to the early Cretaceous, 100-65 million years ago, which is relatively recent in geologic time. If this is the case, where did all the rest of the crust go? This leads us to the second type of plate boundary, which is called a convergent boundary or subduction zone.
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Subduction zones exist at convergent plate boundaries where one plate of oceanic lithosphere converges with another plate. The descending slab, the subducting plate, is over-ridden by the leading edge of the other plate.
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oceanic plates are formed at divergent boundaries mainly at mid ocean ridges. The material that is poured out are basaltic lave in nature. Basalt is denser and heavier than the granite that makes up continental plates. Oceanic plates are much thinner than the continental plates.
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Oceanic plates are much thinner than the continental plates. ... At the convergent boundaries the continental plates are pushed upward and gain thickness. The rocks and geological layers are much older on continental plates than in the oceanic plates. The Continental plates are much less dense than the Oceanic plates.
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When two tectonic plates are pushed together for a long period of time, shards of crust are pushed upward, forming mountain ranges that span the distance of the line between the two tectonic plates. Scientists estimate that this process can take up to 100 million years.
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The dates revealed that the Atlantic Ocean was opening by seafloor spreading from the Mid Atlantic Ridge at a rate of about 0.02 metres per year. This means that North America and Europe are moving away from each other at about the rate it takes for your fingernails to grow.
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Continental parts of the crust are mostly granite, and continental crust averages 30 km deep. Oceanic crust is thinner, with an average depth of 5 km. Oceanic crust is made of denser basaltic rock, and lighter continental granite can ride on top of oceanic plates as tectonic plates shift.
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Divergent boundaries are boundaries where plates pull away from each other, forming mild earthquakes and volcanoes as magma comes to the surface. ... They are formed when two plates collide, either crumpling up and forming mountains or pushing one of the plates under the other and back into the mantle to melt.