How Does The Lithosphere Differ From The Asthenosphere

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How Does The Lithosphere Differ From The Asthenosphere

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The lithosphere is a rigid and brittle solid while the asthenosphere is a soft and ductile solid. (The terms crust and mantle are used to denote differences in chemical composition; while the terms lithosphere and asthenosphere are used to denote differences in physical state (for example, rigid, brittle solid vs.. soft, ductile solid). Because the boundaries between layers with different chemical compositions do not occur at the same depth as boundaries between layers with different physical properties, lithosphere cannot be considered synonymous with crust, not can asthenosphere be considered synonymous with mantle. For example, a large change in chemical composition occurs as you move from crust to mantle. However, there is no change in physical properties at boundary between crust and mantle because uppermost mantle is still cold enough relative to its melting point to behave in the same manner as the crust- as a rigid brittle solid. The transition to a soft ductile solid- the asthenosphere- does not occur until we get further down into the upper mantle - where temperature approaches the melting point of the mantle at that depth.)
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