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Does every volcano form in the mantle?
No, the Earth's mantle is to deep and warm for this. Magmas are generated in the upper mantle by a process called partial melting and the melt collects in the crust (in magma chambers at varying depth).
What happens when a subducting plate reaches about 100 km depth?
When the subducting plate reaches about 100 kilometers (60 miles) into the Earth's hot mantle, it triggers partial melting of the overlying plate and forms new magma. Some of the magma rises and erupts as volcanoes.
Which part of the Earth is the source of magma?
Lava is magma that reaches the surface. Magma originates either from rising plumes of heat at hot spots in the Earth's mantle, where decompression melting takes place as the hot rock nears the surface; or, it originates in the mantle from subduction of oceanic crust, where cold, wet rock speeds melting of the subducting rock and it rises toward the surface.
What is the upper mantle's depth?
2 in.
What is the thickness of the core the mantle and the crust?
From the information I am providing here you can work this out.Inner core: depth of 5,150-6,370 kilometresOuter core: depth of 2,890-5,150 kilometresLower mantle: depth of 650-2,890 kilometresTransition region: depth of 400-650 kilometresUpper mantle: depth of 10-400 kilometresOceanic crust: depth of 0-10 kilometres, Continental crust: depth of 0-75 kilometres
Does every volcano form in the mantle?
No, the Earth's mantle is to deep and warm for this. Magmas are generated in the upper mantle by a process called partial melting and the melt collects in the crust (in magma chambers at varying depth).
What is the difference between the mantle and outer core of the Earth?
There are differences in chemistry (the mantle is mainly ultramafic rock--the outer core is metallic), in phase (the mantle is predominately solid--the outer core is liquid), in depth (the outer core is closer to the center of the Earth), and in density (the outer core is more dense).
What happens when a subducting plate reaches about 100 km depth?
When the subducting plate reaches about 100 kilometers (60 miles) into the Earth's hot mantle, it triggers partial melting of the overlying plate and forms new magma. Some of the magma rises and erupts as volcanoes.
What is the difference in ultramafic rocks and mafic rocks?
Ultramafic rocks like peridotite and dunite, are igneous rocks that have a very low silica content and very high levels of iron and magnesium. They are therefore more dense than most igneous rock and are found at great depth but appearing on the surface due to volcanic eruption.
Which part of the Earth is the source of magma?
Lava is magma that reaches the surface. Magma originates either from rising plumes of heat at hot spots in the Earth's mantle, where decompression melting takes place as the hot rock nears the surface; or, it originates in the mantle from subduction of oceanic crust, where cold, wet rock speeds melting of the subducting rock and it rises toward the surface.
What is the upper mantle's depth?
2 in.
What is the mantle's depth?
ware is the awser?
What is the depth of upper mantle?
2 in.
What is the thickness of the core the mantle and the crust?
From the information I am providing here you can work this out.Inner core: depth of 5,150-6,370 kilometresOuter core: depth of 2,890-5,150 kilometresLower mantle: depth of 650-2,890 kilometresTransition region: depth of 400-650 kilometresUpper mantle: depth of 10-400 kilometresOceanic crust: depth of 0-10 kilometres, Continental crust: depth of 0-75 kilometres
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.
What is the difference between the mantle and the core?
The mantle is composed of hot mafic and ultramafic silicate rock under great enough pressure to prevent it from melting, despite experiencing temperatures which at shallower depths would cause it to liquify. The core is compositionally different from the mantle in that it is composed primarily of iron, with nickel, and minor amounts of other elements. The outer core is considered a liquid metallic alloy, and the inner core is considered a solid alloy. The phase difference is due to the increased pressure existing in the inner core which prevents it from behaving as a liquid despite temperatures that are probably equal to those at the surface of the Sun. The above differences are mainly compositional; however, there are differences in physical properties such as density and temperature (both of which increase with depth), strength and deformation behaviour, as well as things like layer thickness (the mantle is thicker), and depth from surface (the core is deeper).
What part of Earth's mantle is near the outer core?
The Earth comprises:-Continental crust: depth of 0-75 kilometres: Oceanic crust: depth of 0-10 kilometresUpper mantle: depth of 10-400 kilometresTransition region: depth of 400-650 kilometresLower mantle: depth of 650-2,890 kilometresD" layer: depth of 2,700-2,890 kilometresOuter core: depth of 2,890-5,150 kilometresInner core: depth of 5,150-6,370 kilometres
