8

The similarities pretty much end at the fact that both water and lava flow downhill seeking the lowest possible level. As even the most fluid lavas flow somewhat slower than water because of their higher density and viscosity, their lower speed and in particular their viscosity makes them far less erosive of the terrain they flow over/through. In fact lava ...


3

In terms of rheology, there is a key difference between water and lava: water is a Newtonian fluid, lava isn't. In early volcanology days, there has been attempts to model lava as a Newtonian fluid (Nichols, 1939). This approach may be a good approximation in some cases (very fluid lavas, like pāhoehoe flows), but does not work for more viscous lavas ('a'ā ...


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