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Because the temperature of the mantle is fairly constant and a decrease in a materials confining pressure will decrease its melting tempreature so mantle upwelling will lead to only small changes in tempraeture but a large decrease in confining pressure therefore the pressure loss is the dominat factor in melting.
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∙ 12y ago
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When magma forms within the mantle is it the result of high or low temperature and does it have high or low pressure?
Well to answer your question magma forms in all the ways but if it forms at a low temp it need a higher pressure. and it forms at a high temp it needs a low pressure. Hope this helped this might not be 100% right though
What does low silica magma form?
Nealy all magma on Earth is originally low-silica, mafic magma. Most magma originates from the upper mantle, which is ultramafic, meaning it has a very low silica content. This rock may partially melt under certain conditions, forming mafic magma, which has a somewhat higher silica content than the mantle rock.
Is a pyroclastic material high or low-viscosity?
Pyroclastic material can form with magma of any composition, but it is more likely to form with high-viscosity magma.
Do hurricanes form when there is high pressure or low pressure?
Like other storms hurricane are produce by low pressure.
How do high pressure belts form?
They form because of high and low pressure in the atmosphere.
When magma forms within the mantle is it the result of high or low temperature and does it have high or low pressure?
Well to answer your question magma forms in all the ways but if it forms at a low temp it need a higher pressure. and it forms at a high temp it needs a low pressure. Hope this helped this might not be 100% right though
Do tornadoes form when there is low pressure?
Tornadoes are themselves small low pressure areas, and generally form with low pressure systems. Most low pressure systems, however, do not produce tornadoes.
What does low silica magma form?
Nealy all magma on Earth is originally low-silica, mafic magma. Most magma originates from the upper mantle, which is ultramafic, meaning it has a very low silica content. This rock may partially melt under certain conditions, forming mafic magma, which has a somewhat higher silica content than the mantle rock.
Is a pyroclastic material high or low-viscosity?
Pyroclastic material can form with magma of any composition, but it is more likely to form with high-viscosity magma.
Are cumulonimbus clouds low or high pressure?
Low Pressure, A Low Pressure Area allows clouds to form, as a result, you can get a storm from a low pressure area.A High Pressure Area is the exact opposite, it doesn't allow clouds to form, you can get sunny weather from this kind of system.
Do clouds form easily when the air pressure is high or low?
Clouds only form when the air pressure is low.
Do clouds form during high or low pressure system?
low pressure systems
Do hurricanes form when there is high pressure or low pressure?
Like other storms hurricane are produce by low pressure.
What pressure systems do hurricanes form around?
low pressure
What type of pressure causes a tornado to form?
Low pressure.
What is the relationship between Fronts and low-pressure systems?
low pressure systems form at fronts
What is the relationship's between fronts and low pressure systems?
low pressure systems form at fronts
