The phrase "rumbling volcano" refers to a volcano that is making deep, low sounds like thunder, suggesting that it may erupt soon.
Sentences with «rumbling volcano»
With few exceptions, there have been no rumbling volcanoes or major earthquakes. (scientificamerican.com)
Oh and the film cuts to a shot of the rumbling volcano about once every ten minutes or so remind everyone to not worry, act three will absolutely feature explosions. (filmireland.net)
From the top of the mountain we could see the «John Frum Village» nestled between the rumbling volcano and the -LSB-...] (bytheseatofmyskirt.com)