what is the evidence for seafloor spreading quizlet?
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What is the evidence for sea-floor spreading? Several types of evidence supported Hess's theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
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['continental margins.', 'deep ocean basins.', 'mid-ocean ridges.']
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Earth's tectonic plates are in constant motion. Their movement is driven by heat within the Earth. The deep Earth is very hot, while its surface is quite cool. This causes hot material within the Earth to rise, until it reaches the surface where it moves sideways, cools, then sinks.
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Subduction zones are likely to form between converging oceanic and continental plates. Subduction zones are likely to form between converging oceanic and continental plates.
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"ridge push" The lithosphere thickens with distance (and time) away from the midocean ridge. ... "slab pull" As lithospheric plates move away from midocean ridges they cool and become denser. They eventually become more dense than the underlying hot mantle.
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When two plates are moving away from each other, we call this a divergent plate boundary. Along these boundaries, magma rises from deep within the Earth and erupts to form new crust on the lithosphere. Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges.
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Rifting can be caused when hot material from a mantle plume reaches the base of a continental plate and causes the overlying lithosphere to heat up. In addition to this the uwards movement of the plume against the base of the plate results in extensional forces, which can cause rifting.
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When two tectonic plates move away from each other than the divergent boundary occurs. The formation of divergent boundaries causes the rise in the magma from the earth's mantle, the formation of oceanic crusts, and earthquakes. The mid-ocean ridge and middle of the red sea are the divergent plate boundaries.
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The short answer is, it doesn't. The continental plates are lighter than the ocean plate so they float on top of those plates.
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The North American Plate is being pushed west and north west due to sea floor spreading from the Mid Atlantic Ridge (divergent margin). Movement along the fault is not smooth and continual, but sporadic and jerky.
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Evidence of Plate Tectonics. Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. ... Other life dispersed to new areas as continents reconnected, oceans narrowed, or chains of volcanic islands formed.
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Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.
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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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What is the first step of seafloor spreading? A crack forms in oceanic crust. Molten rock rises up through oceanic crust. Molten rock solidifies at the center of the ridge.
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At the deep-sea trenches, two plates converge, with one plate sliding down under the other into the mantle where it is melted. Thus, for each segment of new ocean floor created at the ridges, an equal amount of old oceanic crust is destroyed at the trenches, or so-called subduction zones.
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Several types of evidence supported Hess's theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves. This evidence led scientists to look again at Wegener's hypothesis of continental drift.
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Question: Oceanic Crust Spreads At ____1_______, Creating New Crust And Slowly Enlarging The Ocean Basin. _____2_______ Are Deep Valleys At Passive Continental Boundaries. They Are Likely Carved Out By ____3________, Which Occur When Sediment-laden Water Rapidly Moves Down Slope.