Which of the following statements apply to the asthenosphere, but not the lithosphere?

(A) zone in the upper mantle that deforms by plastic flowage
(B) partial melting of rising granitic plumes produces huge volumes of basaltic magma
(C) cool, rigid layer of crust and upper mantle that forms the tectonic plates
(D) deforms mainly by brittle fracturing and faulting

Respuesta :

Answer:

A because that is pretty much the description of the asthenosphere

Asesthnosphere is the upper part of the mantel and it lies 80 to 200 km. The layer is highly fluidic, dynamic, and viscous. Above this layer, there exists a lithosphere.

  • The asthenosphere is also known as the molten rock due to the presence of magma in this layer that can be seen during the volcanic eruptions and spreading on the mid-oceanic ridges.
  • The seismic waves pass slowly through this layer. There exists a gap or a zone of low velocity know as Moho-discontinuity within the upper mantel and lower crust.

Hence the option A is correct that is a zone of the upper mantel deforms by the plastic flowage.

Learn more about the statements apply to the asthenosphere, but not the lithosphere.

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