When Mount Etna erupted on April 11

When Mount Etna erupted on April 11,2013, it created amazing smoke rings. Toroidal Vortices or Volcanic smoke rings are rare,
but well-documented

ผลลัพธ์ (อังกฤษ) 3:

When Mount Etna April erupted on 11, 2013, it created amazing smoke rings. Toroidal Vortices Volcanic or smoke rings are rare,
but well-documented