mud volcano flowing down clayey mud mixed with hydrocarbons. natural reserve salse of nirano: modena, fiorano, italy

acid bubble clayey cold cone dirt earth environment fiorano flowing gaseous geological geology geothermal geyser gray grey gurgling hole hot hydrocarbon hydrocarbons italy mineral mixed modena mud national natural nature nirano park phenomenon pot reserve salse salt sand shape slush smoke splat steam sulfur surface tourism touristic toxic underground volcanic volcano warm