08-08-2007, 08:01 AM
Just to further complicate matters, lava DOES flow uphill under the right circumstances. Depending on its viscosity, momentum, and the weight of the lava upstream, all kinds of counterintuitive things can happen. The Italians built some elaborate diversion structures on Mt. Aetna which relied somewhat on the premise that it wouldn't go uphill. About half of them worked.
Cheers,
Jerry
Cheers,
Jerry