Oh his normal hair? Yeah it probably would be burned. Not instantaneously but gradually sure. Even without Satan hair though, Sani's fry Gaeshi pre end of 4 beast arc could deflect something like 300,000,000 tons. I forget the number. If Akainu used a magma fist, it can be deflected x1000. If Akainu used haki he'd receive a haki infused magma fist 1000x over.
Sani claimed that his Satan hair could eat the entire mantle of the earth and beyond. Magma shouldn't be a problem. Even were that not true, Satan hair is partly appetite energy. It wouldn't burn entirely and if it did, Akainu would be long gone before his 1,000,000 strands are gone.
Hundreds of mountains? I think that's a slight exaggeration. It looked like several dozen though. Maybe 30-40. I did underrate it though. I'd still sooner say large island or multi island level. I think country level is pushing it unless we're talking about micro nations. It was stated to be much lower than this as othus pointed out. Only called city level, although admittedly it appeared larger than that to me.
I thought was only the dome also. Could be wrong but either way it's very big. But I can't see how a Lanza can be considered city level, yet they put Naruto at small country and Juubi and multi continent levels. The Juubi is one thing since its legend states it could lift continents (although it falls far short of that so far) but since when was Naruto anywhere near country level? The obd justification was that his biju dama was equal to 6 others combined which is true, but we know the destructive scope of a non Juubi/Kyubi biju dama is 1 mountain. While impressive, when did six mountains become country level I wonder.
I'd say it's more just a giant city. Like sveral mid-large cities combined. Small country level is possible but I don't like to high ball feats. But yeah, even a normal human could walk at least a couple hundred kilometers in 3 days. I knew a former soldier who said he walked roughly 70 km a day for a period. Even Ive walked 20 km in a broken up period of about 4 hours.
Well hardly anybody has replied yet. I'm pretty sure the majority will think along the same lines as me but someone might defend Bee. It's not a stomp but Enel has Bee by a mile in speed and reactions and has the necessary power to put him down after a few attacks. His logia defense in scenario 2 is overkill.
Scenario 2 Enel. Scenario 1 Enel without CIS. His speed and incredible observation haki should prevent him from getting hit by Bee intangibility or no. However with CIS he could be hit by a biju dama or any number of other attacks.