Volcanic eruptions are easily explicable on this principle,the volcano being simply a vent for the passage of heated and molten matter, which the elevating pressure of the liquid below tends to eject.

The volcano is not an extinct volcano now; it is the dead stick of a rocket.

"These Alaskan volcanoes are great things.

All this demonstrates that the volcano is the effect of the efforts of the subterraneous fire to get some vent and escape from its confinement.

I was informed by the priests of the neighboring hamlets that the volcano, until the commencement of the seventeenth century, had been a closed cone, and that the lake did not come into existence till half of the mountain fell in, at the time of its great eruption.

Then, usually, the volcano, having vented itself, would be quieter for a time, till the heat accumulated below, and more ash was blasted out, making a second ash-bed; and then would follow a second lava flow.

4. Write out and learn: A volcano is a hole in the ground out of which steam, ashes, mud, and melted rock are thrown.

This volcano was the revolution.