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At mid-ocean ridges, such as the Atlantic Rise and Pacific Rise. As two plates move apart the crust is stretched and thinned, causing less pressure on the mantle immediately below. Due to this drop in pressure the mantle undergoes "decompressional melting" allowing magma to form. This magma is less dense than the surrounding mantle and rises at the mid-ocean ridges, cooling and forming new oceanic crust.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoOceanic crust will eventually turn to magma as it slides under another moving plate
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What happens to mantle rock descending oceanic crust scrapes past continental crust?
The mantle rock descending from the oceanic crust causes the water in oceanic crust to be released. This lowers the melting point of the rock and causes it to melt.
What is the name of ocean crust?
oceanic crust.
What crust is more dense oceanic or continental crust?
Oceanic crust is significantly denser.
How do ocean trenches help explain why crust added at ocean ridges doesn't make earth any larger?
Ocean trenches were discovered as a sign of destructive plate margins. These plate margins cause oceanic crust to subduct below the continental crust at the oceanic-continental boundary, and force the oceanic crust to move down into the Earth's mantle and melt into basaltic magma. As this is happening, magma at oceanic ridges is creating new oceanic crust at the mid-oceanic ridges. Overall, these two processes cancel each other out and so the total amount of oceanic crust is staying aproximately the same. Therefore the Earth is not growing. Hope this helps :)
Is ocean crust or landform crust yonger?
When comparing an oceanic crust and a landform crust, the oceanic crust will be much younger. Typically, an oceanic crust is less than 200 million years old.
What happens to mantle rock descending oceanic crust scrapes past continental crust?
The mantle rock descending from the oceanic crust causes the water in oceanic crust to be released. This lowers the melting point of the rock and causes it to melt.
Does continental crust have a greater density than oceanic crust?
Yes, that is the reason oceanic crust is at a lower elevation compared to continental crust. Oceanic crust sub-ducts under the less dense continental crust. Continental crust is much older than oceanic crust, because oceanic crust is constantly being destroyed and created.
What is the name of ocean crust?
oceanic crust.
Oceanic crust is lighter than the continental crust?
No, the oceanic crust is denser. That's why the land areas "float" so much higher than the ocean bedrock.
What is oceanic-oceanic subduction?
Oceanic crust sinking under a plate with continental crust
What happens at deep ocean trenches?
At some points, the oceanic crust bends downward and forms a deep-ocean trench. Then the oceanic crust sinks back into the mantle through a process called subduction.
What does it mean if the oceanic crust 0?
the oceanic crust is 0.
Is the oceanic crust felsic or mafic?
Oceanic crust is mafic.
What crust is more dense oceanic or continental crust?
Oceanic crust is significantly denser.
Where are the youngest portion of Earth's crust found?
The youngest parts of the Earth's crust are found in the oceanic crust. This crust is continuously being created at the mid-oceanic ridges.
What layer of crust averages 25 miles in thickness?
Continental crust.
Would it be better to drill through the earths crust or the oceanic crust?
oceanic crust
