Strange Smoke Rings Appear in the Sky over Italy

In a strange phenomenon, the "Etna" volcano in Italy released volcanic rings in the shape of circles into the sky. Scientists say that Mount Etna experiences this rare phenomenon, caused by a continuous release of steam and gases, more than any other volcano on Earth. The rings emerged from a new crater that opened on Tuesday at the top of Etna. Mount Etna is an active volcano located on the eastern coast of Sicily, near Messina and Catania. It is one of the largest active volcanoes in Europe and among the most active volcanoes in the world, almost in a constant state of eruptions, which are sometimes quite destructive; however, they are generally not considered extremely dangerous, and thousands of people live on its slopes and surrounding areas.