"The fire at Lipara, Xenophanes says, ceased once for sixteen years, and came back in the seventeenth. And he says tha…"

"Our earth is very old, an old warrior that has lived through many battles. Nevertheless, the face of it is still chan…"

"A map of the moon... should be in every geological lecture room; for no where can we have a more complete or more mag…"

"A bewildering assortment of (mostly microscopic) life-forms has been found thriving in what were once thought to be u…"

"Each volcano is an independent machine—nay, each vent and monticule is for the time being engaged in its own peculiar…"

"[On the volcano.] And many a fire there burns beneath the ground."

"Looking back across the long cycles of change through which the land has been shaped into its present form, let us re…"

"[T]here are depths of thousands of miles which are hidden from our inquiry. The only tidings we have from those unfat…"

"A volcano may be considered as a cannon of immense size."

"On April 10th, 1815, six thousand miles away from here, on an island in Indonesia, a volcano erupted. It sent a massi…"