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What keeps rock in the lower part of the mantle below their melting point?
Wiki User
∙ 13y ago
Pressure from the thousands of miles of rock above.
Wiki User
∙ 13y ago
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What layer of the earth is immediately below the crust?
It is the upper and lower mantle. It has the consistency of warm asphalt.
What is the lower layer of the mantle called?
The mesosphere
What causes melting at mid-ocean ridges?
Mid-ocean ridges occur at diverging plate boundaries. Convection currents in the lower mantle pull the plates away from each other . As the plates move apart, lower mantle material is drawn toward Earth's surface. The rock of the lower mantle is hot, flexible, and solid. This rock is solid because of the great pressure of the layers above it. However, as the rock of the lower mantle rises, the pressure drops and the material melts.
Where is the lower mantle in the inside earth?
Well there is the crust, upper mantle, lower mantle, outer core, and the inner core. So, the lower mantle is the 3rd one down.
Why would decompression of mantle peridotite cause the production of mafic magma?
Melting points vary with pressure. In nearly all substances the melting point increases with increasing pressure. The peridotite in the mantle is extremely hot and under immense pressure. When it is decompressed some melting occurs. The composition is not uniform and some minerals have lower melting points than others. The mafic minerals will be able to melt while the ultramafic mineralls generally will not.
When magma forms within the mantle it is most often a result of?
Either the loss of confining pressure causing the melting point of the material to drop below the in-situ temperature or due to the presence of volatiles which enter the mantle where subduction occurs and also lower the melting point of the material.
Why isn't earths entire mantle liquid?
The mantle isn't 100% liquid because magma solidifies near the crust and becomes plastic in texture and not fluid but eventually cools down to form the lithosphere. Lower parts of the mantle are not liquid because the high pressure keeps rock from melting.
Most basaltic magmas are believed to form by partial melting of granite in the lower crust and upper mantle?
This statement would be considered incorrect. Basaltic magmas originate from the melting of mantle rock or oceanic crust.
What lies below Earths Lower Mantle?
From the outside into the Earth. It goes Crust, Upper Mantle, Mantle, Outer Core, and Inner Core
Earths lower mantle lies just below the?
Upper Mantle. This is also called the Asthenosphere
What layer of the earth is immediately below the crust?
It is the upper and lower mantle. It has the consistency of warm asphalt.
What is the lower layer of the mantle called?
The mesosphere
What is above the lower mantle?
The middle mantle is just above the lower mantle.
What is the lower part of the mantle callet?
The Lower Mantle
What is the lower mantle beneath?
The lower mantle is beneath the crust.
What part of the earths mantle that flows and moves the plates of the earth?
Mantle plumes are in the mantle, BELOW the Earth's crust. The circulation of heat from the lower mantle to the upper mantle can cause "hot spots" in the overlying crust, heating the magma in the areas.
How is pressure involved in melting mantle material at a mid-ocean ridge?
Pressure is involved because as the plates move apart, lower mantle material is hot, flexible, and solid. This rock is solid because of the great pressure of the layers above it. However. as the rock of the lower mantle rises, the pressure drops and the material melts.
