Which factor most increases isostatic rebound rates in fjord regions post-glaciation?

💡 Explanation

When ice sheets melt, isostatic rebound occurs because the reduced load causes buoyant uplift in the Earth's crust, mediated by mantle flow; lower mantle viscosity allows faster crustal response. Therefore mantle viscosity influences rebound rates, rather than erosion, remaining ice cover, or ocean thermal expansion which have secondary effects.

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