Respuesta :
- The mantle is normally molten and not liquid.
- A lithosphere is a planet's or a natural satellite's stiff, outermost rocky shell. It is made up of the crust and the region of the upper mantle on Earth that exhibits elastic behaviour over periods of thousands of years or longer.
- The ductile and weakly mechanical asthenosphere is found in the upper mantle of the Earth. Between 80 and 200 km below the surface, it extends as far as 700 km beneath the lithosphere. However, the asthenosphere's lower boundary is not clearly defined.
- The asthenosphere cools as it ascends and merges with the lithosphere if the lithosphere has not yet separated.
- Olivine, garnet, and pyroxene are examples of common silicates discovered in the mantle. Magnesium oxide is the other main form of rock that can be found in the mantle.
- The mantle is composed of semi-molten rock known as magma. The majority of the rock is solid in the upper mantle. The rock is soft and travels gently further down. Magma can occasionally force its way through fissures in the Earth's crust and erupt as lava from a volcano.
- Midocean ridges are the sites where hot magma upwells and produces the oceanic lithosphere. As the material departs from the spreading core, it cools to form the plates. Heat flow lessens as the plate cools, and the seafloor gets deeper. But the only depth at which lithospheric temperatures may be measured is one kilometre.
- Rock that is semi-plastic makes up the Asthenosphere. Because it is less dense than the asthenosphere, the lithosphere floats on top of it, much like an iceberg or a piece of wood does on water. More hard and less plastic is present in the lower mantle below the asthenosphere. The outer core is located below the mantle.
- The asthenosphere is thought to be substantially hotter than the lithosphere, ranging in temperature from 300 to 500 degrees Celsius. This is because the asthenosphere is primarily solid, with some areas having rock that is partially molten. Sep 1, 2011
- The majority of the rocks that make up the Earth's mantle are silicates, a large class of substances with a common silicon and oxygen structure. The mantle is composed of semi-molten rock known as magma. In the upper mantle, the rock is largely solid. The rock is soft and travels gently further down. Magma can occasionally force its way through fissures in the Earth's crust and erupt as lava from a volcano.
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