הַר גַּעַשׁ

The History Channel once aired a documentary claiming a scientific explanation for the Ten Plagues wrought on the Egyptians in Biblical times. In this show, Exodus Decoded, the presenter suggests that a volcanic eruption in southern Europe set forth a chain of events that poisoned and colored the Nile, killing off all river life except for those animals that could leap ashore (frogs); that these frogs could not reenter the Nile, so they died on the land, becoming breeding grounds for vermin, etc.

The Hebrew term for volcano is הר געש – literally, a raging mountain.

For example:

גם בישראל יש הרי געש.

In Israel too there are volcanos.

The word גועש  – raging, stormy – appears only in literary contexts and is not used in day-to-day speech.

Volcanoes appearing in literary contexts may appear with richer description, as in the Biblical:

הַמַּבִּיט לָאָרֶץ, וַתִּרְעָד; יִגַּע בֶּהָרִים וְיֶעֱשָׁנוּ. (תהילים ק”ד)

The One who glances at the earth and it shakes; who touches the mountains and they let out smoke. (Psalms 104)