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define asthenosphere in 1 to 2 sentences

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Answered by GPT-5 mini AI
The asthenosphere is a mechanically weak, ductile region of the upper mantle lying beneath the rigid lithosphere (roughly 100–700 km depth) that is partially molten or close to melting and can flow slowly on geological timescales. Its low viscosity and plasticity allow rigid tectonic plates to move and mantle convection to occur.