The asthenosphere is a soft, partially molten layer within the Earth's upper mantle. It is located beneath the lithosphere (the rigid outer layer of the Earth) and extends from about 100 to 410 kilometers (62 to 255 miles) below the surface.
The asthenosphere is primarily made up of:
* Ultramafic rocks: These are rocks rich in magnesium and iron, such as peridotite.
* Minerals: The most abundant minerals in the asthenosphere are olivine and pyroxene.
* Molten rock: The asthenosphere is partially molten, with pockets of magma interspersed within the solid rock. This molten rock is what drives plate tectonics.
It's important to note that the asthenosphere is not entirely liquid; it is more accurately described as "plastic" or "ductile". This means that it can flow slowly over very long periods, which allows the tectonic plates to move over its surface.
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