Rivers of molten rock obliterating all in their path, earth tremors, toxic gases and a pall of smoke spreading across the skies - volcanoes and their devastatin... » 

Rivers of molten rock obliterating all in their path, earth tremors, toxic gases and a pall of smoke spreading across the skies - volcanoes and their devastating effects have been shrouded in legend since the dawn of time. This is a study of this geological phenomena. «