你知道著名的庞贝古城吗？
Historical Background of The Ancient City of Pompeii
In the early afternoon hours of August 24,79 A．D.the summit of Mount Vesuvius exploded without warning.A black river of ash and lapilli ran from the crater of the volcano down through the city of Pompeii leaving death and destruction in its wake.The magnificent ancient city of Pompeii was left buried under about 20 feet of earth and ash.Pompeii was originally only 500 meters from the sea，but after the eruption the distance to the sea increased to two kilometers.
