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The melting temperature of materials is affected by their confining pressure. The higher the pressure the higher the melting temperature. As such as you move deeper into the mantle, the tempraeture will increase, but because of the overlying material so to will the confining pressure which drives up the melting temperature.
When high temperature mantle material moves nearer to the surface such as near a mid-ocean-ridge the confining pressure falls faster than the materials temperature and this can cause the melting point to drop below the temperature of the material leading to melting.
What else can I help you with?
Is the lower mantle solid or liquid?
The lower part of the Mantle is liquid.
Why isn't the Earth's entire mantle liquid?
The Earth's mantle is not entirely liquid because the temperature and pressure conditions vary throughout the mantle. While the high temperatures in the lower mantle can cause some rock to partially melt and flow, the majority of the mantle remains solid due to the higher pressure that prevents complete melting.
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.
What is the state of matter in the upper mantle?
solid
Name the layer of the earth between the crust and the core that is the part liquid part solid?
The layer of the Earth between the crust and the core that is partially liquid and partially solid is the mantle. The upper mantle is solid rock, while the lower mantle is semi-fluid due to high temperatures and pressure.
How would the earth's mantle react under gentle continuous pressure?
it will steady as liquid form and hot
Is the earth a solid or a liquid?
Both. The upper mantle is solid and the lower mantle is liquid.
What is the mantle core like?
The core is solid metal surrounded by liquid metal, the mantle is liquid rock.
What is the approximate pressure at the mantle-outer core interface?
The D'' area of the mantle extends from 2798 km to 2900 km, which is the boundary between the mantle and the liquid outer core. At this level, the pressures are enormous, roughly equal to 1.4 million units of atmospheric pressure.
Is the mantle solid liquid or other?
Liquid I Think
Why is the mantle made up of semi liquid rock?
It is a semi-liquid rock as the sheer amount of pressure in this area is so strong, solid lumps are still formed however they would become liquid if you allow them to expand.
What keeps the mantle from turning into liquid?
The mantle rock is not hot enough to melt while under the pressure that exists at the depth it is at.When the crust cracks like it does at the spreading centers at mid-ocean ridges, the pressure is released just enough to allow melting of the top layer of the mantle, producing very dense basaltic lava.
