Sulfurous

On the moon Io, a volcano erupted, spewing molten lava and sulfurous gases.

The rover lumbered on the lonely sulfurous ground of the volcanic moon Io.

It must be so—I will arise and waken The multitude, and like a sulphurous hill, Which on a sudden from its snows had shaken The swoon of ages, it shall burst, and fill The world with cleansing fire; it must, it will— It may not be restrained!