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Whether that explains long flip-free periods is untested.","posed_since":"","precise":"Test whether time variations of the total core-mantle boundary heat flow $Q_{\\mathrm{cmb}}$ and its lateral pattern over $10^{8}$ yr, taken from mantle-convection reconstructions, quantitatively reproduce the observed reversal-rate history including the Cretaceous Normal Superchron. An answer is either dynamo simulations driven by reconstructed CMB heat-flux histories that match the reversal-rate record, or a demonstration that rate swings of this size arise intrinsically at fixed boundary conditions.","problem_ref":"2fa0bce50285a61bd157439a7bfd79f7500854dc12fc02053435a9e8c4db83eb","references":"","settled_by":"Dynamo runs forced by plate-reconstruction-based CMB heat-flux histories compared statistically with the 0 to 200 Ma reversal record.","status_note":"","title":"Do mantle heat-flux changes cause superchrons and reversal-rate 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