Explanation: Ridges form along cracks in the oceanic crust ,Molten rock rises through these cracks and pushes to both sides.
Dynamic Earth: Charac. of the Seafloor Flashcards | Quizlet
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Which material rises from cracks in oceanic crust pillow shaped rocks continental crust molten rock dense crust?
Ridges form along cracks (divergent boundaries) in the oceanic crust (Molten rock (magma) rises through these cracks and pushes to both sides.
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What happens to old oceanic crust as new material rises from the mantle?
Old oceanic crust melts as it sinks back into the mantle Because it is less dense than the surrounding rock, molten. material from the mantle rises through the crust toward cracks in the ocean floor. The processes of subduction and sea-floor spreading can change the size and shape of the oceans.
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What type of rocks are found in oceanic crust?
Oceanic Crust Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust.
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What is a crack between converging oceanic crust?
3. The crack between converging oceanic crusts process by which the leading edge ofan oceanic crust submerged into the mantle is called a rift zone.
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What are made when an oceanic crust meets continental crust?
When oceanic crust collides with a continent, an oceanic-continental convergent boundary forms. The oceanic plate is denser, so it undergoes subduction. This means that the oceanic plate sinks beneath the continent, forming a deep ocean trench.
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What is formed on top of one of the oceanic crusts as another oceanic crust Subducts beneath it?
A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs.
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Which materials rises from cracks in oceanic crust?
Eventually, the crust cracks. Hot magma fueled by mantle convection bubbles up to fill these fractures and spills onto the crust. This bubbled-up magma is cooled by frigid seawater to form igneous rock. This rock (basalt) becomes a new part of Earth’s crust.
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Which material rises from cracks in oceanic crust odense crust molten rock continental crust pillow shaped rocks?
Molten rock rises up through the crust. Dense plates are subducted under less dense plates. A crack forms in oceanic crust.
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Which type of material becomes molten rock?
Magma is a molten and semi-molten rock mixture found under the surface of the Earth. On the rare occasions when magma breaks the surface, as in a volcanic eruption, it is called lava.
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Why is oceanic crust denser?
As stated, oceanic plates are denser than continental ones. This is because they are made of denser rocks. Oceanic plates are typically composed of basalt. Basalts are mafic igneous rocks, which means they have a silica (quartz) content of less than 20% and are created by the cooling of lava.
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What happens to old oceanic crust as new crust forms?
At subduction zones, the edge of the denser plate subducts, or slides, beneath the less-dense one. The denser lithospheric material then melts back into the Earth’s mantle. Seafloor spreading creates new crust. Subduction destroys old crust.
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What happens to old oceanic crust as new molten material rises from the mantle quizlet?
What happens to old oceanic crust as new molten material rises from the mantle? The old crust is pushed away and new crust takes over. The arrows on the figure show the ocean floor spreading from the ridge.
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What happens to the older crust?
As new crust forms, older crust is pushed off to the sides. It soon plunges below the continental crust and back into the mantle. So most ocean crust is no more than about 200 million years old, compared to up to four billion years for the oldest continental crust.
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What happens to the age of oceanic crust as distance increases from a ridge?
Seafloor Ages The rocks get older with distance from the ridge crest. Scientists were surprised to find that the oldest seafloor is less than 180 million years old. This may seem old, but the oldest continental crust is around 4 billion years old.
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