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Whether a realistic weakening process closes that gap is unknown.","posed_since":"","precise":"Mantle convection models give plate-like behavior only for lithospheric yield stresses of roughly $10^{9} \\text{ to } 3 \\times 10^{9}\\,\\mathrm{dyn}/\\mathrm{cm}^{2}$, while laboratory-derived lithospheric strength is of order $10^{10}\\,\\mathrm{dyn}/\\mathrm{cm}^{2}$. Determine whether a lab-calibrated rheology (grain damage with Zener pinning, low-temperature plasticity, fluid effects) yields plate-like convection in 3D spherical models at Earth parameters. An answer is such a model or a proof that the gap remains.","problem_ref":"3cb6ca8838d6b49e7b1c7988343850d19edaa14cd220a18812dfd0a9f6249219","references":"","settled_by":"Spherical convection simulations with only experimentally constrained rheological parameters showing or failing to show plate-like surface motion.","status_note":"","title":"Can lab-based rock rheology produce plate-like 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