>    I'm having a job to see where it's flowing uphill?

Look at the central lava river coming down... It seems to dissapear into 
some kind of "dip" in the surface, yet continues flowing over the rip of 
that dip (hence "uphill").

Of course, liquid rock is hot. And liquid. But it's still heavy. I 
imagine lava has quite a lot of momentum if it's moving fast... it's 
just a question of how much momentum exactly.

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