were rumbling
Past progressiveconjugation ofrumble.There are other translations for this conjugation.

rumble

Throughout most of 2004 four of our Indonesian volcanoes were rumbling away including our local one in Maumere, Mount Egon.
En total en 2004, tuvimos cuatro erupciones de nuestros volcanes en Indonesia, incluso el nuestro en Maumere, Monte Egon.
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