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:
“This religion takes away the courage of thinking of unusual things and prohibits self-examination above all as the most egregious of sins.... It is one step away from protestantism.”
—Stendhal [Marie Henri Beyle] (1783–1842)