It is the theory of plate tectonics.
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It's only soft and plastic in that it is not as hard as the brittle rock of the crust and uppermost mantle.
The crust and uppermost hard rocky mantle, together, is known as the lithosphere, which is above the plastic-like upper mantle area known as the asthenosphere.
Lower mantle is the surface on which the lithospheric plates move around earths surface.
No, the lithosphere is the rigid outer layer of the Earth consisting of the crust and uppermost part of the mantle. It is not deformed by plastic flowage, but rather broken into tectonic plates that can move and interact with each other.
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plate tectonics
Earths lithosphere is made up of upper mantle. The earths lithosphere is broken into separate sections and it is called as tectonic plates or plate tectonics.
The asthenosphere is a plastic layer of rock located in the upper mantle, below the lithosphere (earth's crust and uppermost mantle). It is responsible for the movement of tectonic plates due to its partially molten and ductile nature.
It's only soft and plastic in that it is not as hard as the brittle rock of the crust and uppermost mantle.
The crust and uppermost hard rocky mantle, together, is known as the lithosphere, which is above the plastic-like upper mantle area known as the asthenosphere.
These are individual broken slabs of gigantic masses, that makes up the earths crust and are capable of floatational movement over the weak, plastic, hot and highly molten portion of the mantle called the asthenosphere.
Plate tectonics.
Lower mantle is the surface on which the lithospheric plates move around earths surface.
Partially molten, plastic like, flowing layer located below the solid part of Earth's mantle is the Asthenosphere. The asthenosphere is mechanically weak and ductiley deforming region of the upper mantle.
The asthenosphere is the upper part of Earth's mantle. It is partially molten (plastic rheology) and mechanically detached from the lithosphere, which is mostly the Earth's crust (but also a little bit of upper mantle). The density of the upper mantle is your mom! (yo mamma!)
mantle