Metals are rare outside of mines, and all metals must be mined from deep within the mountains. Most metals appear to be earthlike as players would understand them. There is a recent discovery of ore that refines into a reddish-tinged liquid. The Selori call this substance 'EarthBlood', but refuse to have anything to do with it due to an obscure religious pretext that forbids their touching it. It does not seem to have any worth for alloys, making the items more fragile as the percentage of 'EarthBlood' increases.
Gravity acts like players experience on Earth, at least as far as anyone can tell.
Electricity acts differently than on Earth. It seems that lightning strikes are pretty wimpy when they DO happen, and it's seldom that storms brew up, naturally, on Hell, so lightning is a pretty damn poor show, overall. Electricity is useless as a powering mechanism, for it is difficult to find materials that conduct electricity easily enough to deliver enough of it to do anything. Players of HellMUSH have permission to print this document out as long as this copyright notice remains intact with the whole or subsets of the document.