mount vesuvius , a stratovolcano in modern-day italy , erupted Process_start in 79 ad in one of the deadliest volcanic eruptions Catastrophe in european history , which was witnessed and documented Recording by pliny the younger , a roman administrator and poet .

mount vesuvius violently spewed Self_motion forth a deadly cloud of unk tephra and gases to a height of , ejecting Motion molten rock , pulverized Destroying pumice and hot ash at 1.5 million tons per second , ultimately releasing 100,000 times the thermal energy of the unk bombings .