Characterized by its bright yellow color, sulfur can take many forms (or oxidation states)—elemental sulfur ions, mineral sulfate and sulfide gas. It does that by changing its valence ...

Hydrogen sulfide dissolved in water corrodes metals such as iron, steel, copper and brass. The corrosion of iron and steel from sulfur forms ferrous sulfide or "black water." Hydrogen sulfide in water ...

A rock on Mars spilled a surprising yellow treasure after Curiosity accidentally cracked through its unremarkable exterior.

Carbon (C): Carbon, a nonmetallic element, forms a number of organic and inorganic ... When making steel, it reacts with sulfur and helps to increase the metal's resistance to heat.

Curiosity's view of the Gediz Valley channel. (NASA/JPL-Caltech/MSSS) Pure sulfur, on the other hand, only forms under a very narrow set of conditions, which are not known to have occurred in the ...