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The mantle can be subdivided into the upper and lower mantle.
The uppermost part of the upper mantle is part of the lithosphere, and is sold and rigid. The lower part of the upper mantle is partially molten, and hence can flow.
The lower mantle is solid, but behaves in a plastic fashion, much like blu-tack.
The mantle is predominantly composed of an ultramafic rock called peridotite.
Further Detail:
The Earth's mantle is the largest layer of the Earth by volume accounting for around 84% of the Earth. It is approximately 2885 kilometers thick.
The Earth's mantle is composed of rocks that have higher concentrations of mafic minerals (containing iron and magnesium) and lower in concentrations of the felsic minerals (aluminum and silica) than the rocks of Earth's crust.
The concentrations of the above elements therefore mean that the Earth's mantle is composed of a series of minerals that are predominately calcium / iron / magnesium aluminum silicates.
Such as:
- Olivine - (Mg,Fe)2SiO4
- Pyroxene - X(Si,Al)2O6, where X represents either calcium, sodium, iron or magnesium
- Spinel - MgAl2O4
- Garnet - X3Y2(SiO4)3 where X and Y can be a mixture of aluminum, iron, calcium, manganese or magnesium.
At depths shallower than approximately 460 km, these minerals form the rocks types Peridotite, Dunite (Olivine-rich Peridotite), and Eclogite.
At depths greater than 410 km Olivine becomes unstable and is replaced by a number of different mineral forms known as poly-morphs which are stable at higher pressures. These include Wadsleyite which forms at depths between 410 and 520 km and Ringwoodite which forms between 520 and 600 km deep.
These depths are based on a number of seismic dicontinuities at the depths of 410 km (thought to mark the transition from Olivine to Wadsleyite) and at 520 km (thought to mark the transition from Wadsleyite to Ringwoodite) respectively.
At depths greater than around 650 km these upper mantle minerals start to become unstable due to the increased pressure and the minerals below this take the structure of the minerals Perovskite and Ferropericlase although with differing chemical compositions and it is this seismic discontinuity at 650 km depth that marks the transition to the lower mantle.
Its heat comes from left over radiation from the Earth's creation.
It is more denser than the crust. not
It contains more iron than silica.
It is 1800 miles thick and makes up more than two thirds of earts mass
What else can I help you with?
What is the ultimate source of heat that moves the plates?
The ultimate source of heat that drives plate tectonics is believed to be the Earth's internal heat from radioactive decay in the mantle. This heat causes convection currents in the mantle, which in turn drive the movement of the tectonic plates.
Which force drives subduction?
An undersea mountain chain where new ocean floor is produced
How do earths mantels move when cooler?
Earth's mantle moves primarily through the process of convection. When the mantle cools, it becomes denser and sinks deeper into the Earth, while hotter, less dense material rises. This movement creates convection currents that drive the slow, but continuous, flow of the mantle. These currents play a crucial role in tectonic plate movement and the dynamics of Earth's geology.
What moves up the earths surface in a pipe?
magma moves up earth suface
What moves through earths mantle by convection?
In Earth's mantle, heat from the core causes the mantle material to move through convection. Hotter, less dense material rises towards the surface, while cooler, denser material sinks. This movement drives the tectonic plates above, leading to geological processes such as earthquakes, volcanic activity, and continental drift. Convection in the mantle plays a crucial role in the dynamic nature of Earth's geology.
Where does magma form before it moves toward the earths surface?
in the mantle above the slab
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.
What happens to old oceanic crust as molten materials rises from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
What moves on a plasticlike layer of the mantle?
The crust moves on a plastic like layer of the mantle.
What moves a plasticlike layer of the mantle?
The crust moves on a plastic like layer of the mantle.
Why the mantle moves?
It moves because of convection currents
What is the ultimate source of heat that moves the plates?
The ultimate source of heat that drives plate tectonics is believed to be the Earth's internal heat from radioactive decay in the mantle. This heat causes convection currents in the mantle, which in turn drive the movement of the tectonic plates.
How is heat transfer in the earths mantle related to the movement of the earths crust?
Heat transfer in the Earth's mantle drives the movement of the Earth's crust through the process of convection. As mantle material heats up, it becomes less dense and rises, causing the overlying crust to move. At the same time, cooler mantle material sinks back down, completing the cycle of heat transfer and driving the continuous motion of tectonic plates.
What moves Earth's tetonic plates?
the upper mantle
What happens when the earths crust moves?
erosion
Is it when earths plate moves it erodes?
no that a earthquake
Which force drives subduction?
An undersea mountain chain where new ocean floor is produced
