When analysed at the Galbraith laboratories, Knoxville, Tennessee, USA, it was found that these sulphur balls are 95-98% pure sulphur. The impurities in the sulphur are metals that would add to the heat given off. These sulphur balls burn at 5,000-6,000 degrees Fahrenheit. The Galbraith Laboratories said that a BTU test could not be done as it would damage their stainless steel testing chamber!
The brown burn ring can be clearly seen around the sulphur
These sulphur balls must have been burning at some time in the past, because of the presence of brown burn rings around them. This is a sulphur compound formed when molten sulphur cools very quickly, and is evidence that these sulphur balls were once on fire.
These cities are indeed unique. Other cities that have been destroyed by fire or by volcanoes, like Pompeii, have a layer of ash on top, but under that is the original material. Here, however, we see entire cities completely turned to ash, exactly as the Bible describes.