Unusual Characteristics
In the 1970s Etna erupted smoke rings, one of the first captured events of this type, which are extremely rare. This happened again in 2000.
Read more about this topic: Mount Etna
Famous quotes containing the word unusual:
“As a result of a general defect of nature, we are either more confident or more fearful of unusual and unknown things.”
—Julius Caesar [Gaius Julius Caesar] (100–44 B.C.)